20564530 has 64 divisors (see below), whose sum is σ = 45163008. Its totient is φ = 6589440.

The previous prime is 20564513. The next prime is 20564561. The reversal of 20564530 is 3546502.

It is a junction number, because it is equal to n+sod(n) for n = 20564495 and 20564504.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 85210 + ... + 85450.

It is an arithmetic number, because the mean of its divisors is an integer number (705672).

Almost surely, 2^20564530 is an apocalyptic number.

20564530 is an abundant number, since it is smaller than the sum of its proper divisors (24598478).

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

20564530 is a wasteful number, since it uses less digits than its factorization.

20564530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331.

The product of its (nonzero) digits is 3600, while the sum is 25.

The square root of 20564530 is about 4534.8131163257. The cubic root of 20564530 is about 273.9720521337.

The spelling of 20564530 in words is "twenty million, five hundred sixty-four thousand, five hundred thirty".