Tingnan ang wikitext ng 20 (bilang)

:''Para sa ibang gamit, tingnan [[20 (paglilinaw)]].''
{{Infobox number
| number =  20
| numeral = bigesimal
| divisor = 1, 2, 4, 5, 10, 20
}}
Ang '''20''' ('''dalawampu''') ay isang [[likas na bilang]] at bilang rasyonal na pagkatapos ng [[19 (bilang)|19]] at bago ng 21.

== Sa matematika ==
[[File:Icosahedron.svg|thumb|Isang ''icosahedron'' na may 20 mukha]]
*Isang pronikong bilang ang 20.<ref>{{Cite web|url=https://oeis.org/A002378|title=Sloane's A002378: Pronic numbers|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2020-11-30}}</ref>
*Isang tetrahedrikong bilang ang 20 bilang 1, 4, 10, 20.<ref>{{Cite web|url=https://oeis.org/A000292|title=Sloane's A000292 : Tetrahedral numbers|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-05-31|language=en}}</ref>
*Batay ang 20 para sa sistemang bilang na bigesimal.<ref>{{Cite web|last=Weisstein|first=Eric W.|title=Vigesimal|url=https://mathworld.wolfram.com/Vigesimal.html|access-date=2020-08-16|website=mathworld.wolfram.com|language=en}}</ref>
* Ang 20 ay ang ikatlong numerong kompuwesto na produkto ng isang kinuwadradong [[pangunahing bilang|pangunahin]] at isang pangunahin, at ito din ang ikalawang kasapi ng (''2''<sup>2</sup>)''q'' na pamilya sa anyong ito.
*Ang 20 ay ang pinakamaliit na primitibong masaganang [[bilang]].<ref>{{Cite web|url=https://oeis.org/A071395|title=Sloane's A071395 : Primitive abundant numbers|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-05-31|language=en}}</ref>
*May 20 mukha ang isang ''icosahedron''.<ref>{{Cite web|last=Weisstein|first=Eric W.|title=Icosahedron|url=https://mathworld.wolfram.com/Icosahedron.html|access-date=2020-08-16|website=mathworld.wolfram.com|language=en}}</ref> May 20 ''vertex'' ang ''dodecahedron''.<ref>{{Cite web|last=Weisstein|first=Eric W.|title=Dodecahedron|url=https://mathworld.wolfram.com/Dodecahedron.html|access-date=2020-08-16|website=mathworld.wolfram.com|language=en}}</ref>
*Maaring isulat ang 20 bilang ang kabuuan ng tatlong [[bilang na Fibonacci]] na natatangi, i.e. 20 = 13 + 5 + 2.<ref>{{Cite book|last=Dunlap|first=R. A.|url=https://books.google.com/books?id=Pq2AekTsF6oC&q=20+can+be+written+as+the+sum+of+three+Fibonacci+numbers+uniquely&pg=PA72|title=The Golden Ratio and Fibonacci Numbers|date=1997|publisher=World Scientific|isbn=978-981-238-630-4|pages=72–73|language=en}}</ref>

==Mga sanggunian==
{{reflist}}
{{Stub|Bilang}}
[[Kategorya:Bilang]]