Twenty thousand eight hundred five
20805 is an odd number.
20805 is a Harshad number, which means it is divisible by the sum of its digits (2 + 0 + 8 + 0 + 5 = 15, and 20805 is divisible by 15).
In binary, 20805 is represented as 101000101000101.
In hex, 20805 is represented as 5145.
Prime factorization of 20805: 3 * 5 * 19 * 73.
Factors of 20805 are: 1, 3, 5, 15, 19, 57, 73, 95, 219, 285, 365, 1095, 1387, 4161, 6935, 20805.