Twenty thousand one
20001 is an odd number.
20001 is a Harshad number, which means it is divisible by the sum of its digits (2 + 0 + 0 + 0 + 1 = 3, and 20001 is divisible by 3).
In binary, 20001 is represented as 100111000100001.
In hex, 20001 is represented as 4e21.
Prime factorization of 20001: 3 * 59 * 113.