205120564 has 24 divisors (see below), whose sum is σ = 393871968. Its totient is φ = 92694240.

The previous prime is 205120541. The next prime is 205120571. The reversal of 205120564 is 465021502.

It is a congruent number.

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, 5862 + ... + 21085.

It is an arithmetic number, because the mean of its divisors is an integer number (16411332).

Almost surely, 2^205120564 is an apocalyptic number.

It is an amenable number.

205120564 is a deficient number, since it is larger than the sum of its proper divisors (188751404).

205120564 is a wasteful number, since it uses less digits than its factorization.

205120564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27135 (or 27133 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 205120564 is about 14322.0307219333. The cubic root of 205120564 is about 589.7524231775.

The spelling of 205120564 in words is "two hundred five million, one hundred twenty thousand, five hundred sixty-four".