204564556 has 24 divisors (see below), whose sum is σ = 410699520. Its totient is φ = 87334032.

The previous prime is 204564541. The next prime is 204564589. The reversal of 204564556 is 655465402.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6526 + ... + 21253.

It is an arithmetic number, because the mean of its divisors is an integer number (17112480).

Almost surely, 2^204564556 is an apocalyptic number.

It is an amenable number.

204564556 is an abundant number, since it is smaller than the sum of its proper divisors (206134964).

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

204564556 is a wasteful number, since it uses less digits than its factorization.

204564556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28053 (or 28051 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 37.

The square root of 204564556 is about 14302.6066155789. The cubic root of 204564556 is about 589.2190721486.

It can be divided in two parts, 204564 and 556, that added together give a triangular number (205120 = T₆₄₀).

The spelling of 204564556 in words is "two hundred four million, five hundred sixty-four thousand, five hundred fifty-six".