204500900 has 18 divisors (see below), whose sum is σ = 443767170. Its totient is φ = 81800320.

The previous prime is 204500899. The next prime is 204500909. The reversal of 204500900 is 9005402.

It can be written as a sum of positive squares in 3 ways, for example, as 3541924 + 200958976 = 1882^2 + 14176^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (204500909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1022405 + ... + 1022604.

Almost surely, 2^204500900 is an apocalyptic number.

204500900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

204500900 is an abundant number, since it is smaller than the sum of its proper divisors (239266270).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

204500900 is a wasteful number, since it uses less digits than its factorization.

204500900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2045023 (or 2045016 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 204500900 is about 14300.3811138025. The cubic root of 204500900 is about 589.1579484604.

The spelling of 204500900 in words is "two hundred four million, five hundred thousand, nine hundred".