205631564 has 12 divisors (see below), whose sum is σ = 368632488. Its totient is φ = 100308000.

The previous prime is 205631557. The next prime is 205631581. The reversal of 205631564 is 465136502.

It is a super-2 number, since 2×205631564² = 84568680226172192, which contains 22 as substring.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 205631564.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 626762 + ... + 627089.

It is an arithmetic number, because the mean of its divisors is an integer number (30719374).

Almost surely, 2^205631564 is an apocalyptic number.

It is an amenable number.

205631564 is a deficient number, since it is larger than the sum of its proper divisors (163000924).

205631564 is a wasteful number, since it uses less digits than its factorization.

205631564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1253896 (or 1253894 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 32.

The square root of 205631564 is about 14339.8592740654. The cubic root of 205631564 is about 590.2417509727.

The spelling of 205631564 in words is "two hundred five million, six hundred thirty-one thousand, five hundred sixty-four".