20000 (number)

Number
number = 20000
range = 10000 - 100000
cardinal = 20000
ordinal = th
ordinal text = twenty thousandth
factorization = $2^5\; cdot\; 5^4$
bin = 100111000100000
oct = 47040
hex = 4E20

20,000 (twenty thousand) is the number that comes after 19,999 and before 20,001.

elected numbers

* 20000 - round number; also in the title of Jules Verne's novel "20,000 Leagues Under The Sea"
* 20081 - Motorola 68K instruction for no operation (NOP)
* 20160 - the smallest order belonging to two non-isomorphic simple groups: the alternating group A₈ and the Chevalley group "A"₂(4)
* 20161 - the largest integer that can't be expressed as a sum of two abundant numbers
* 20230 - pentagonal pyramidal number
* 20412 - Leyland number
* 20540 - square pyramidal number
* 20569 - tetranacci number
* 20903 - first prime of form 120"k"+23 that is "not" a full reptend prime
* 20965 - chiliagonal number
* 21147 - Bell number
* 21181 - one of nine remaining Seventeen or Bust numbers in the Sierpinski problem
* 21856 - octahedral number
* 22050 - pentagonal pyramidal number
* 22140 - square pyramidal number
* 22222 - Kaprekar number
* 22447 - cuban prime
* 22527 - Woodall number
* 22699 - one of nine remaining Seventeen or Bust numbers in the Sierpinski problem
* 23401 - Leyland number
* 23409 - sum of the cubes of the first 17 positive integers
* 23497 - cuban prime
* 23821 - square pyramidal number
* 23969 - octahedral number
* 23976 - pentagonal pyramidal number
* 24211 - Zeisel number
* 24571 - cuban prime
* 24601 - Jean Valjean's prisoner number in Les Miserables
* 24631 - Wedderburn-Etherington number
* 24737 - one of nine remaining Seventeen or Bust numbers in the Sierpinski problem
* 25011 - the first composite number that in base 10 remains composite after any insertion of a digit
* 25085 - Zeisel number
* 25117 - cuban prime
* 25205 - largest number whose factorial is less than 10¹⁰⁰⁰⁰⁰
* 25585 - square pyramidal number
* 26214 - octahedral number
* 26227 - cuban prime
* 26861 - smallest number below which there are more primes of the form 4k + 1 than of the form 4k + 3
* 27434 - square pyramidal number
* 27559 - Zeisel number
* 27648 - 1¹*2²*3³*4⁴
* 27720 - smallest number divisible by the numbers 1 to 12 (there is no smaller number divisible by the numbers 1 to 11)
* 27846 - harmonic divisor number
* 27952 - chiliagonal number
* 28158 - pentagonal pyramidal number
* 28374 - smallest integer to start a run of six consecutive integers with the same number of divisors
* 28595 - octahedral number
* 28657 - Fibonacci number, Markov number
* 29241 - sum of the cubes of the first 18 positive integers
* 29341 - Carmichael number
* 29370 - square pyramidal number