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class="vector-toc-contents" id="mw-panel-toc-list"> <li id="toc-mw-content-text" class="vector-toc-list-item vector-toc-level-1"> <a href="#" class="vector-toc-link"> <div class="vector-toc-text">Bevezető</div> </a> </li> <li id="toc-A_szám_a_matematikában" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#A_szám_a_matematikában"> <div class="vector-toc-text"> <span class="vector-toc-numb">1</span> <span>A szám a matematikában</span> </div> </a> <ul id="toc-A_szám_a_matematikában-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Jegyzetek" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Jegyzetek"> <div class="vector-toc-text"> <span class="vector-toc-numb">2</span> <span>Jegyzetek</span> </div> </a> <ul id="toc-Jegyzetek-sublist" class="vector-toc-list"> </ul> </li> </ul> </div> </div> </nav> </div> </div> <div class="mw-content-container"> <main id="content" class="mw-body"> <header class="mw-body-header vector-page-titlebar"> <nav aria-label="Tartalomjegyzék" class="vector-toc-landmark"> <div id="vector-page-titlebar-toc" class="vector-dropdown vector-page-titlebar-toc vector-button-flush-left" title="Tartalomjegyzék" > <input type="checkbox" id="vector-page-titlebar-toc-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-titlebar-toc" class="vector-dropdown-checkbox " aria-label="Tartalomjegyzék kinyitása/becsukása" > <label id="vector-page-titlebar-toc-label" for="vector-page-titlebar-toc-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-listBullet mw-ui-icon-wikimedia-listBullet"></span> <span class="vector-dropdown-label-text">Tartalomjegyzék kinyitása/becsukása</span> </label> <div class="vector-dropdown-content"> <div id="vector-page-titlebar-toc-unpinned-container" class="vector-unpinned-container"> </div> </div> </div> </nav> <h1 id="firstHeading" class="firstHeading mw-first-heading"><span class="mw-page-title-main">420 (szám)</span></h1> <div id="p-lang-btn" class="vector-dropdown mw-portlet mw-portlet-lang" > <input type="checkbox" id="p-lang-btn-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-p-lang-btn" class="vector-dropdown-checkbox mw-interlanguage-selector" aria-label="Ugrás egy más nyelvű szócikkre. Elérhető 24 nyelven" > <label id="p-lang-btn-label" for="p-lang-btn-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-24" aria-hidden="true" ><span class="vector-icon mw-ui-icon-language-progressive mw-ui-icon-wikimedia-language-progressive"></span> <span class="vector-dropdown-label-text">24 nyelv</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-en mw-list-item"><a href="https://en.wikipedia.org/wiki/420_(number)" title="420 (number) – angol" lang="en" hreflang="en" data-title="420 (number)" data-language-autonym="English" data-language-local-name="angol" class="interlanguage-link-target"><span>English</span></a></li><li class="interlanguage-link interwiki-ar badge-Q70894304 mw-list-item" title=""><a href="https://ar.wikipedia.org/wiki/420_(%D8%B9%D8%AF%D8%AF)" title="420 (عدد) – arab" lang="ar" hreflang="ar" data-title="420 (عدد)" data-language-autonym="العربية" data-language-local-name="arab" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-ckb mw-list-item"><a href="https://ckb.wikipedia.org/wiki/%D9%A4%D9%A2%D9%A0_(%DA%98%D9%85%D8%A7%D8%B1%DB%95)" title="٤٢٠ (ژمارە) – közép-ázsiai kurd" lang="ckb" hreflang="ckb" data-title="٤٢٠ (ژمارە)" data-language-autonym="کوردی" data-language-local-name="közép-ázsiai kurd" class="interlanguage-link-target"><span>کوردی</span></a></li><li class="interlanguage-link interwiki-cs mw-list-item"><a href="https://cs.wikipedia.org/wiki/420_(%C4%8D%C3%ADslo)" title="420 (číslo) – cseh" lang="cs" hreflang="cs" data-title="420 (číslo)" data-language-autonym="Čeština" data-language-local-name="cseh" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-eml mw-list-item"><a href="https://eml.wikipedia.org/wiki/420_(n%C3%B9mer)" title="420 (nùmer) – Emiliano-Romagnolo" lang="egl" hreflang="egl" data-title="420 (nùmer)" data-language-autonym="Emiliàn e rumagnòl" data-language-local-name="Emiliano-Romagnolo" class="interlanguage-link-target"><span>Emiliàn e rumagnòl</span></a></li><li class="interlanguage-link interwiki-eu mw-list-item"><a href="https://eu.wikipedia.org/wiki/Laurehun_eta_hogei" title="Laurehun eta hogei – baszk" lang="eu" hreflang="eu" data-title="Laurehun eta hogei" data-language-autonym="Euskara" data-language-local-name="baszk" class="interlanguage-link-target"><span>Euskara</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%DB%B4%DB%B2%DB%B0_(%D8%B9%D8%AF%D8%AF)" title="۴۲۰ (عدد) – perzsa" lang="fa" hreflang="fa" data-title="۴۲۰ (عدد)" data-language-autonym="فارسی" data-language-local-name="perzsa" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-fi mw-list-item"><a href="https://fi.wikipedia.org/wiki/420_(luku)" title="420 (luku) – finn" lang="fi" hreflang="fi" data-title="420 (luku)" data-language-autonym="Suomi" data-language-local-name="finn" class="interlanguage-link-target"><span>Suomi</span></a></li><li class="interlanguage-link interwiki-ga mw-list-item"><a href="https://ga.wikipedia.org/wiki/420_(uimhir)" title="420 (uimhir) – ír" lang="ga" hreflang="ga" data-title="420 (uimhir)" data-language-autonym="Gaeilge" data-language-local-name="ír" class="interlanguage-link-target"><span>Gaeilge</span></a></li><li class="interlanguage-link interwiki-ht mw-list-item"><a href="https://ht.wikipedia.org/wiki/420_(nonm)" title="420 (nonm) – haiti kreol" lang="ht" hreflang="ht" data-title="420 (nonm)" data-language-autonym="Kreyòl ayisyen" data-language-local-name="haiti kreol" class="interlanguage-link-target"><span>Kreyòl ayisyen</span></a></li><li class="interlanguage-link interwiki-hyw mw-list-item"><a href="https://hyw.wikipedia.org/wiki/420_(%D5%A9%D5%AB%D6%82)" title="420 (թիւ) – Western Armenian" lang="hyw" hreflang="hyw" data-title="420 (թիւ)" data-language-autonym="Արեւմտահայերէն" data-language-local-name="Western Armenian" class="interlanguage-link-target"><span>Արեւմտահայերէն</span></a></li><li class="interlanguage-link interwiki-it mw-list-item"><a href="https://it.wikipedia.org/wiki/420_(numero)" title="420 (numero) – olasz" lang="it" hreflang="it" data-title="420 (numero)" data-language-autonym="Italiano" data-language-local-name="olasz" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/420" title="420 – japán" lang="ja" hreflang="ja" data-title="420" data-language-autonym="日本語" data-language-local-name="japán" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/420" title="420 – koreai" lang="ko" hreflang="ko" data-title="420" data-language-autonym="한국어" data-language-local-name="koreai" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-ms mw-list-item"><a href="https://ms.wikipedia.org/wiki/420_(nombor)" title="420 (nombor) – maláj" lang="ms" hreflang="ms" data-title="420 (nombor)" data-language-autonym="Bahasa Melayu" data-language-local-name="maláj" class="interlanguage-link-target"><span>Bahasa Melayu</span></a></li><li class="interlanguage-link interwiki-mzn mw-list-item"><a href="https://mzn.wikipedia.org/wiki/%DB%B4%DB%B2%DB%B0_(%D8%B9%D8%AF%D8%AF)" title="۴۲۰ (عدد) – mázanderáni" lang="mzn" hreflang="mzn" data-title="۴۲۰ (عدد)" data-language-autonym="مازِرونی" data-language-local-name="mázanderáni" class="interlanguage-link-target"><span>مازِرونی</span></a></li><li class="interlanguage-link interwiki-ps mw-list-item"><a href="https://ps.wikipedia.org/wiki/%DB%B4%DB%B2%DB%B0_(%D8%B9%D8%AF%D8%AF)" title="۴۲۰ (عدد) – pastu" lang="ps" hreflang="ps" data-title="۴۲۰ (عدد)" data-language-autonym="پښتو" data-language-local-name="pastu" class="interlanguage-link-target"><span>پښتو</span></a></li><li class="interlanguage-link interwiki-sv mw-list-item"><a href="https://sv.wikipedia.org/wiki/420_(tal)" title="420 (tal) – svéd" lang="sv" hreflang="sv" data-title="420 (tal)" data-language-autonym="Svenska" data-language-local-name="svéd" class="interlanguage-link-target"><span>Svenska</span></a></li><li class="interlanguage-link interwiki-sw mw-list-item"><a href="https://sw.wikipedia.org/wiki/Mia_nne_na_ishirini" title="Mia nne na ishirini – szuahéli" lang="sw" hreflang="sw" data-title="Mia nne na ishirini" data-language-autonym="Kiswahili" data-language-local-name="szuahéli" class="interlanguage-link-target"><span>Kiswahili</span></a></li><li class="interlanguage-link interwiki-tt mw-list-item"><a href="https://tt.wikipedia.org/wiki/420_(%D1%81%D0%B0%D0%BD)" title="420 (сан) – tatár" lang="tt" hreflang="tt" data-title="420 (сан)" data-language-autonym="Татарча / tatarça" data-language-local-name="tatár" class="interlanguage-link-target"><span>Татарча / tatarça</span></a></li><li class="interlanguage-link interwiki-ur mw-list-item"><a href="https://ur.wikipedia.org/wiki/420_(%D8%B9%D8%AF%D8%AF)" title="420 (عدد) – urdu" lang="ur" hreflang="ur" data-title="420 (عدد)" data-language-autonym="اردو" data-language-local-name="urdu" class="interlanguage-link-target"><span>اردو</span></a></li><li class="interlanguage-link interwiki-uz mw-list-item"><a href="https://uz.wikipedia.org/wiki/420_(son)" title="420 (son) – üzbég" lang="uz" hreflang="uz" data-title="420 (son)" data-language-autonym="Oʻzbekcha / ўзбекча" data-language-local-name="üzbég" class="interlanguage-link-target"><span>Oʻzbekcha / ўзбекча</span></a></li><li class="interlanguage-link interwiki-vi mw-list-item"><a href="https://vi.wikipedia.org/wiki/420_(s%E1%BB%91)" title="420 (số) – vietnámi" lang="vi" hreflang="vi" data-title="420 (số)" data-language-autonym="Tiếng Việt" data-language-local-name="vietnámi" class="interlanguage-link-target"><span>Tiếng Việt</span></a></li><li class="interlanguage-link interwiki-zh-yue mw-list-item"><a href="https://zh-yue.wikipedia.org/wiki/420" title="420 – kantoni" lang="yue" hreflang="yue" data-title="420" data-language-autonym="粵語" data-language-local-name="kantoni" class="interlanguage-link-target"><span>粵語</span></a></li> </ul> <div class="after-portlet after-portlet-lang"><span class="wb-langlinks-edit wb-langlinks-link"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q1069731#sitelinks-wikipedia" title="Nyelvközi hivatkozások szerkesztése" class="wbc-editpage">Hivatkozások szerkesztése</a></span></div> </div> </div> </div> </header> <div class="vector-page-toolbar"> <div class="vector-page-toolbar-container"> <div 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class="wb-otherproject-link wb-otherproject-wikibase-dataitem mw-list-item"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q1069731" title="Kapcsolt adattárelem [g]" accesskey="g"><span>Wikidata-adatlap</span></a></li> </ul> </div> </div> </div> </div> </div> </div> </nav> </div> </div> </div> <div class="vector-column-end"> <div class="vector-sticky-pinned-container"> <nav class="vector-page-tools-landmark" aria-label="Oldal eszközök"> <div id="vector-page-tools-pinned-container" class="vector-pinned-container"> </div> </nav> <nav class="vector-appearance-landmark" aria-label="Megjelenés"> <div id="vector-appearance-pinned-container" class="vector-pinned-container"> <div id="vector-appearance" class="vector-appearance vector-pinnable-element"> <div class="vector-pinnable-header vector-appearance-pinnable-header vector-pinnable-header-pinned" data-feature-name="appearance-pinned" data-pinnable-element-id="vector-appearance" data-pinned-container-id="vector-appearance-pinned-container" data-unpinned-container-id="vector-appearance-unpinned-container" > <div class="vector-pinnable-header-label">Megjelenés</div> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-appearance.pin">áthelyezés az oldalsávba</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-appearance.unpin">elrejtés</button> </div> </div> </div> </nav> </div> </div> <div id="bodyContent" class="vector-body" aria-labelledby="firstHeading" data-mw-ve-target-container> <div class="vector-body-before-content"> <div class="mw-indicators"> <div id="mw-indicator-indicator-fr-review-status" class="mw-indicator"><indicator name="fr-review-status" class="mw-fr-review-status-indicator" id="mw-fr-revision-toggle"><span class="cdx-fr-css-icon-review--status--stable"></span><b>Ellenőrzött</b></indicator></div> </div> <div id="siteSub" class="noprint">A Wikipédiából, a szabad enciklopédiából</div> </div> <div id="contentSub"><div id="mw-content-subtitle"><div id="mw-fr-revision-messages"><div id="mw-fr-revision-details" class="mw-fr-revision-details-dialog" style="display:none;"><div tabindex="0"></div><div class="cdx-dialog cdx-dialog--horizontal-actions"><header class="cdx-dialog__header cdx-dialog__header--default"><div class="cdx-dialog__header__title-group"><h2 class="cdx-dialog__header__title">Változat állapota</h2><p class="cdx-dialog__header__subtitle">Ez a lap egy ellenőrzött változata</p></div><button class="cdx-button cdx-button--action-default cdx-button--weight-quiet
							cdx-button--size-medium cdx-button--icon-only cdx-dialog__header__close-button" aria-label="Close" onclick="document.getElementById("mw-fr-revision-details").style.display = "none";" type="submit"><span class="cdx-icon cdx-icon--medium
							cdx-fr-css-icon--close"></span></button></header><div class="cdx-dialog__body">Ez a <a href="/wiki/Wikip%C3%A9dia:Jel%C3%B6lt_lapv%C3%A1ltozatok" title="Wikipédia:Jelölt lapváltozatok">közzétett változat</a>, <a class="external text" href="https://hu.wikipedia.org/w/index.php?title=Speci%C3%A1lis:Rendszernapl%C3%B3k&type=review&page=420_(sz%C3%A1m)">ellenőrizve</a>: <i>2023. augusztus 27.</i><p><table id="mw-fr-revisionratings-box" class="flaggedrevs-color-1" style="margin: auto;" cellpadding="0"><tr><td class="fr-text" style="vertical-align: middle;">Pontosság</td><td class="fr-value40" style="vertical-align: middle;">ellenőrzött</td></tr></table></p></div></div><div tabindex="0"></div></div></div></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="hu" dir="ltr"><table class="dablink noprint noviewer" style="padding-left: 2em; vertical-align: middle;" cellpadding="0" cellspacing="0"><tbody><tr><td style="padding-right:.25em;"><span typeof="mw:File"><a href="/wiki/F%C3%A1jl:Disambig.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/7/72/Disambig.svg/19px-Disambig.svg.png" decoding="async" width="19" height="15" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/7/72/Disambig.svg/29px-Disambig.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/7/72/Disambig.svg/38px-Disambig.svg.png 2x" data-file-width="230" data-file-height="183" /></a></span></td><td><i>Ez a szócikk a négyszázhúszas számról szól. A 420. évről szóló cikket lásd itt: <a href="/wiki/420" title="420">420</a>. </i></td></tr></tbody></table> <table class="infobox ujinfobox"> <tbody><tr><td colspan="2" class="fejlec matematikainfobox" style="color:black;background-color:#7bba6a;">420<br /> <small style="font-style:italic;">(négyszázhúsz)</small></td></tr><tr><td colspan="2" style="text-align:center;"><div style="text-align:center"><small>… <a href="/wiki/416_(sz%C3%A1m)" title="416 (szám)">416</a> <a href="/wiki/417_(sz%C3%A1m)" title="417 (szám)">417</a> <a href="/wiki/418_(sz%C3%A1m)" title="418 (szám)">418</a> <a href="/wiki/419_(sz%C3%A1m)" title="419 (szám)">419</a> </small><b>« 420 »</b><small> <a href="/wiki/421_(sz%C3%A1m)" title="421 (szám)">421</a> <a href="/wiki/422_(sz%C3%A1m)" title="422 (szám)">422</a> <a href="/wiki/423_(sz%C3%A1m)" title="423 (szám)">423</a> <a href="/wiki/424_(sz%C3%A1m)" title="424 (szám)">424</a> …</small></div><div style="text-align:center"><small>… <a href="/wiki/380_(sz%C3%A1m)" title="380 (szám)">380</a> <a href="/wiki/390_(sz%C3%A1m)" title="390 (szám)">390</a> <a href="/wiki/400_(sz%C3%A1m)" title="400 (szám)">400</a> <a href="/wiki/410_(sz%C3%A1m)" title="410 (szám)">410</a> </small>•<small> <a href="/wiki/430_(sz%C3%A1m)" title="430 (szám)">430</a> <a href="/wiki/440_(sz%C3%A1m)" title="440 (szám)">440</a> <a href="/wiki/450_(sz%C3%A1m)" title="450 (szám)">450</a> <a href="/wiki/460_(sz%C3%A1m)" title="460 (szám)">460</a> …</small></div> <div style="text-align:center"><small>… <a href="/wiki/100_(sz%C3%A1m)" title="100 (szám)">100</a> <a href="/wiki/200_(sz%C3%A1m)" title="200 (szám)">200</a> <a href="/wiki/300_(sz%C3%A1m)" title="300 (szám)">300</a> <a href="/wiki/400_(sz%C3%A1m)" title="400 (szám)">400</a> </small>•<small> <a href="/wiki/500_(sz%C3%A1m)" title="500 (szám)">500</a> <a href="/wiki/600_(sz%C3%A1m)" title="600 (szám)">600</a> <a href="/wiki/700_(sz%C3%A1m)" title="700 (szám)">700</a> <a href="/wiki/800_(sz%C3%A1m)" title="800 (szám)">800</a> …</small></div></td></tr><tr><td class="fejezet" colspan="2" style="padding:1px 0px;background-color:#7bba6a;color:black;text-align:center;"><b>Tulajdonságok</b></td></tr><tr valign="top"><td class="cimke" style="padding:0px 3px 0px 0px;"><b><a href="/wiki/Norm%C3%A1lalak" title="Normálalak">Normálalak</a></b></td><td>4,2 · 10<sup>2</sup></td></tr><tr valign="top"><td class="cimke" style="padding:0px 3px 0px 0px;"><b><a href="/wiki/Kanonikus_alak#Számelmélet" title="Kanonikus alak">Kanonikus alak</a></b></td><td>2<sup>2</sup> · 3<sup>1</sup> · 5<sup>1</sup> · 7<sup>1</sup></td></tr><tr valign="top"><td class="cimke" style="padding:0px 3px 0px 0px;"><b><a href="/wiki/Oszthat%C3%B3s%C3%A1g" title="Oszthatóság">Osztók</a></b></td><td>1, 2, 3, 4, 5, 6, 7, 10, 12, 14, 15, 20, 21, 28, 30, 35, 42, 60, 70, 84, 105, 140, 210, 420</td></tr><tr valign="top"><td class="cimke" style="padding:0px 3px 0px 0px;"><b><a href="/wiki/R%C3%B3mai_sz%C3%A1m%C3%ADr%C3%A1s" title="Római számírás">Római számmal</a></b></td><td>CDXX</td></tr><tr><td class="fejezet" colspan="2" style="padding:3px 2px;background-color:#7bba6a;color:black;text-align:center;"><b>Számrendszerek</b></td></tr><tr valign="top"><td class="cimke" style="padding:0px 3px 0px 0px;"><b><a href="/wiki/Kettes_sz%C3%A1mrendszer" title="Kettes számrendszer">Bináris alak</a></b></td><td>1 1010 0100<sub>2</sub></td></tr><tr valign="top"><td class="cimke" style="padding:0px 3px 0px 0px;"><b><a href="/wiki/Nyolcas_sz%C3%A1mrendszer" title="Nyolcas számrendszer">Oktális alak</a></b></td><td>644<sub>8</sub></td></tr><tr valign="top"><td class="cimke" style="padding:0px 3px 0px 0px;"><b><a href="/wiki/Tizenhatos_sz%C3%A1mrendszer" title="Tizenhatos számrendszer">Hexadecimális alak</a></b></td><td>1A4<sub>16</sub></td></tr><tr><td class="fejezet" colspan="2" style="padding:3px 2px;background-color:#7bba6a;color:black;text-align:center;"><b>Számelméleti függvények értékei</b></td></tr><tr valign="top"><td class="cimke" style="padding:0px 3px 0px 0px;"><b><a href="/wiki/Euler-f%C3%BCggv%C3%A9ny" title="Euler-függvény">Euler-függvény</a></b></td><td>96</td></tr><tr valign="top"><td class="cimke" style="padding:0px 3px 0px 0px;"><b><a href="/wiki/M%C3%B6bius-f%C3%BCggv%C3%A9ny" title="Möbius-függvény">Möbius-függvény</a></b></td><td>0</td></tr><tr valign="top"><td class="cimke" style="padding:0px 3px 0px 0px;"><b><a href="/wiki/Mertens-f%C3%BCggv%C3%A9ny" title="Mertens-függvény">Mertens-függvény</a></b></td><td>0</td></tr><tr valign="top"><td class="cimke" style="padding:0px 3px 0px 0px;"><b><a href="/wiki/Oszt%C3%B3sz%C3%A1mf%C3%BCggv%C3%A9ny" title="Osztószámfüggvény">Osztók száma</a></b></td><td>24</td></tr><tr valign="top"><td class="cimke" style="padding:0px 3px 0px 0px;"><b><a href="/wiki/Oszt%C3%B3%C3%B6sszegf%C3%BCggv%C3%A9ny" title="Osztóösszegfüggvény">Osztók összege</a></b></td><td>1344<br /><i><a href="/wiki/B%C5%91velked%C5%91_sz%C3%A1mok" title="Bővelkedő számok">bővelkedő szám</a></i></td></tr><tr valign="top"><td class="cimke" style="padding:0px 3px 0px 0px;"><b><a href="/wiki/Val%C3%B3dioszt%C3%B3%C3%B6sszeg-f%C3%BCggv%C3%A9ny" title="Valódiosztóösszeg-függvény">Valódiosztó-összeg</a></b></td><td><a href="/wiki/923_(sz%C3%A1m)" title="923 (szám)">923</a></td></tr></tbody></table> <p>A <b>420</b> (római számmal: CDXX) egy <a href="/wiki/Term%C3%A9szetes_sz%C3%A1mok" title="Természetes számok">természetes szám</a>. </p> <div class="mw-heading mw-heading2"><h2 id="A_szám_a_matematikában"><span id="A_sz.C3.A1m_a_matematik.C3.A1ban"></span>A szám a matematikában</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=420_(sz%C3%A1m)&action=edit&section=1" title="Szakasz szerkesztése: A szám a matematikában"><span>szerkesztés</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>A <a href="/wiki/T%C3%ADzes_sz%C3%A1mrendszer" title="Tízes számrendszer">tízes számrendszerbeli</a> 420-as a <a href="/wiki/Kettes_sz%C3%A1mrendszer" title="Kettes számrendszer">kettes számrendszerben</a> <i>110100100</i>, a <a href="/wiki/Nyolcas_sz%C3%A1mrendszer" title="Nyolcas számrendszer">nyolcas számrendszerben</a> <i>644</i>, a <a href="/wiki/Tizenhatos_sz%C3%A1mrendszer" title="Tizenhatos számrendszer">tizenhatos számrendszerben</a> <i>1A4</i> alakban írható fel. </p><p>A 420 <a href="/wiki/P%C3%A1ros_%C3%A9s_p%C3%A1ratlan_sz%C3%A1mok" title="Páros és páratlan számok">páros szám</a>, <a href="/wiki/%C3%96sszetett_sz%C3%A1mok" title="Összetett számok">összetett szám</a>, <a href="/wiki/T%C3%A9glalapsz%C3%A1m" class="mw-redirect" title="Téglalapszám">téglalapszám</a> (20 · 21). <a href="/wiki/Kanonikus_alak" title="Kanonikus alak">Kanonikus alakban</a> a 2<sup>2</sup> · 3<sup>1</sup> · 5<sup>1</sup> · 7<sup>1</sup> szorzattal, <a href="/wiki/Norm%C3%A1lalak" title="Normálalak">normálalakban</a> a 4,2 · 10<sup>2</sup> szorzattal írható fel. Huszonnégy <a href="/wiki/Oszthat%C3%B3s%C3%A1g" title="Oszthatóság">osztója</a> van a természetes számok halmazán, ezek növekvő sorrendben: <a href="/wiki/1_(sz%C3%A1m)" title="1 (szám)">1</a>, <a href="/wiki/2_(sz%C3%A1m)" title="2 (szám)">2</a>, <a href="/wiki/3_(sz%C3%A1m)" title="3 (szám)">3</a>, <a href="/wiki/4_(sz%C3%A1m)" title="4 (szám)">4</a>, <a href="/wiki/5_(sz%C3%A1m)" title="5 (szám)">5</a>, <a href="/wiki/6_(sz%C3%A1m)" title="6 (szám)">6</a>, <a href="/wiki/7_(sz%C3%A1m)" title="7 (szám)">7</a>, <a href="/wiki/10_(sz%C3%A1m)" title="10 (szám)">10</a>, <a href="/wiki/12_(sz%C3%A1m)" title="12 (szám)">12</a>, <a href="/wiki/14_(sz%C3%A1m)" title="14 (szám)">14</a>, <a href="/wiki/15_(sz%C3%A1m)" title="15 (szám)">15</a>, <a href="/wiki/20_(sz%C3%A1m)" title="20 (szám)">20</a>, <a href="/wiki/21_(sz%C3%A1m)" title="21 (szám)">21</a>, <a href="/wiki/28_(sz%C3%A1m)" title="28 (szám)">28</a>, <a href="/wiki/30_(sz%C3%A1m)" title="30 (szám)">30</a>, <a href="/wiki/35_(sz%C3%A1m)" title="35 (szám)">35</a>, <a href="/wiki/42_(sz%C3%A1m)" title="42 (szám)">42</a>, <a href="/wiki/60_(sz%C3%A1m)" title="60 (szám)">60</a>, <a href="/wiki/70_(sz%C3%A1m)" title="70 (szám)">70</a>, <a href="/wiki/84_(sz%C3%A1m)" title="84 (szám)">84</a>, <a href="/wiki/105_(sz%C3%A1m)" title="105 (szám)">105</a>, <a href="/wiki/140_(sz%C3%A1m)" title="140 (szám)">140</a>, <a href="/wiki/210_(sz%C3%A1m)" title="210 (szám)">210</a> és 420. </p><p><a href="/wiki/Er%C5%91sen_b%C5%91velked%C5%91_sz%C3%A1m" class="mw-redirect" title="Erősen bővelkedő szám">Erősen bővelkedő szám</a>: osztóinak összege nagyobb, mint bármely nála kisebb pozitív <a href="/wiki/Eg%C3%A9sz_sz%C3%A1mok" title="Egész számok">egész szám</a> osztóinak összege. </p><p><a href="/wiki/Ritk%C3%A1n_t%C3%B3ciens_sz%C3%A1mok" title="Ritkán tóciens számok">Ritkán tóciens szám</a>.<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> </p><p>A 420 négyzete 176 400, köbe 74 088 000, négyzetgyöke 20,49390, köbgyöke 7,48887, reciproka 0,0023810. A 420 egység sugarú kör kerülete 2638,93783 egység, területe 554 176,94409 területegység; a 420 egység sugarú <a href="/wiki/G%C3%B6mb" title="Gömb">gömb</a> térfogata 310 339 088,7 térfogategység. </p> <div class="mw-heading mw-heading2"><h2 id="Jegyzetek">Jegyzetek</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=420_(sz%C3%A1m)&action=edit&section=2" title="Szakasz szerkesztése: Jegyzetek"><span>szerkesztés</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="ref-1col"><div style="-moz-column-count:2; -webkit-column-count:2; column-count:2; -webkit-column-gap: 3em; -moz-column-gap: 3em; column-gap: 3em;"><ol class="references"> <li id="cite_note-1"><span class="mw-cite-backlink"><a href="#cite_ref-1">↑</a></span> <span class="reference-text">(<a rel="nofollow" class="external text" href="//oeis.org/A036913">A036913</a> sorozat az <a href="/wiki/On-Line_Encyclopedia_of_Integer_Sequences" title="On-Line Encyclopedia of Integer Sequences">OEIS</a>-ben)</span> </li> </ol></div></div><div class="ref-1col"><div style="-moz-column-count:2; -webkit-column-count:2; column-count:2; -webkit-column-gap: 3em; -moz-column-gap: 3em; column-gap: 3em;"></div></div> <div class="tarsprojekt-alap noviewer"> <style data-mw-deduplicate="TemplateStyles:r27252708">.mw-parser-output .tarsprojekt-alap{float:right;clear:right;width:272px;display:flex;column-gap:10px;margin:0 0 1em 1em;border:1px solid #a2a9b1;padding:4px;background-color:var(--background-color-neutral-subtle,#f8f9fa);color:var(--color-base,#202122);font-size:95%}@media screen and (max-width:719px){.mw-parser-output .tarsprojekt-alap{float:none;width:auto;margin:0 0 1em}}@media print{.mw-parser-output .tarsprojekt-alap{display:none}}</style> <div class="tarsprojekt-alap-ikon"><span typeof="mw:File"><a href="https://commons.wikimedia.org/wiki/Category:420_(number)" title="commons:Category:420 (number)"><img alt="Commons:Category:420 (number)" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/4a/Commons-logo.svg/50px-Commons-logo.svg.png" decoding="async" width="50" height="67" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/4a/Commons-logo.svg/75px-Commons-logo.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/4a/Commons-logo.svg/100px-Commons-logo.svg.png 2x" data-file-width="1024" data-file-height="1376" /></a></span></div> <div class="tarsprojekt-alap-szoveg">A <a href="/wiki/Wikim%C3%A9dia_Commons" title="Wikimédia Commons">Wikimédia Commons</a> tartalmaz <i><b><a href="https://commons.wikimedia.org/wiki/Category:420_(number)" class="extiw" title="commons:Category:420 (number)">420 (szám)</a></b></i> témájú médiaállományokat.</div> </div></div><noscript><img src="https://login.wikimedia.org/wiki/Special:CentralAutoLogin/start?useformat=desktop&type=1x1&usesul3=0" alt="" width="1" height="1" style="border: none; position: absolute;"></noscript> <div class="printfooter" data-nosnippet="">A lap eredeti címe: „<a dir="ltr" href="https://hu.wikipedia.org/w/index.php?title=420_(szám)&oldid=26356305">https://hu.wikipedia.org/w/index.php?title=420_(szám)&oldid=26356305</a>”</div></div> <div id="catlinks" class="catlinks" data-mw="interface"><div id="mw-normal-catlinks" class="mw-normal-catlinks"><a href="/wiki/Wikip%C3%A9dia:Kateg%C3%B3ri%C3%A1k" title="Wikipédia:Kategóriák">Kategória</a>: <ul><li><a href="/wiki/Kateg%C3%B3ria:Eg%C3%A9sz_sz%C3%A1mok_(1%E2%80%931000)" title="Kategória:Egész számok (1–1000)">Egész számok (1–1000)</a></li></ul></div></div> </div> </main> </div> <div class="mw-footer-container"> <footer id="footer" class="mw-footer" > <ul id="footer-info"> <li id="footer-info-lastmod"> A lap utolsó módosítása: 2023. augusztus 10., 22:36</li> <li id="footer-info-copyright">A lap szövege <a rel="nofollow" class="external text" href="http://creativecommons.org/licenses/by-sa/4.0/deed.hu">Creative Commons Nevezd meg! – Így add tovább! 4.0</a> licenc alatt van; egyes esetekben más módon is felhasználható. 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