204090856 has 32 divisors (see below), whose sum is σ = 415814400. Its totient is φ = 93553920.

The previous prime is 204090847. The next prime is 204090869. The reversal of 204090856 is 658090402.

It is a happy number.

It is a Smith number, since the sum of its digits (34) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 16945 + ... + 26368.

It is an arithmetic number, because the mean of its divisors is an integer number (12994200).

Almost surely, 2^204090856 is an apocalyptic number.

It is an amenable number.

204090856 is an abundant number, since it is smaller than the sum of its proper divisors (211723544).

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

204090856 is a wasteful number, since it uses less digits than its factorization.

204090856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43369 (or 43365 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 204090856 is about 14286.0370992098. The cubic root of 204090856 is about 588.7639121731.

The spelling of 204090856 in words is "two hundred four million, ninety thousand, eight hundred fifty-six".