20536564 has 12 divisors (see below), whose sum is σ = 36049888. Its totient is φ = 10236600.

The previous prime is 20536547. The next prime is 20536589. The reversal of 20536564 is 46563502.

It is a congruent number.

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, 6432 + ... + 9079.

Almost surely, 2^20536564 is an apocalyptic number.

It is an amenable number.

20536564 is a deficient number, since it is larger than the sum of its proper divisors (15513324).

20536564 is a wasteful number, since it uses less digits than its factorization.

20536564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15846 (or 15844 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 31.

The square root of 20536564 is about 4531.7285885190. The cubic root of 20536564 is about 273.8478029497.

The spelling of 20536564 in words is "twenty million, five hundred thirty-six thousand, five hundred sixty-four".