20564572 has 18 divisors (see below), whose sum is σ = 41177192. Its totient is φ = 8803104.

The previous prime is 20564561. The next prime is 20564573. The reversal of 20564572 is 27546502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20564573) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 23568 + ... + 24424.

Almost surely, 2^20564572 is an apocalyptic number.

It is an amenable number.

20564572 is an abundant number, since it is smaller than the sum of its proper divisors (20612620).

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

20564572 is an frugal number, since it uses more digits than its factorization.

20564572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1725 (or 866 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 31.

The square root of 20564572 is about 4534.8177471647. The cubic root of 20564572 is about 273.9722386493.

The spelling of 20564572 in words is "twenty million, five hundred sixty-four thousand, five hundred seventy-two".