20456564 has 12 divisors (see below), whose sum is σ = 35852964. Its totient is φ = 10212864.

The previous prime is 20456551. The next prime is 20456573. The reversal of 20456564 is 46565402.

It can be written as a sum of positive squares in 2 ways, for example, as 13380964 + 7075600 = 3658^2 + 2660^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20456564.

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, 557 + ... + 6420.

It is an arithmetic number, because the mean of its divisors is an integer number (2987747).

Almost surely, 2^20456564 is an apocalyptic number.

It is an amenable number.

20456564 is a deficient number, since it is larger than the sum of its proper divisors (15396400).

20456564 is a wasteful number, since it uses less digits than its factorization.

20456564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7714 (or 7712 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 32.

The square root of 20456564 is about 4522.8933217577. The cubic root of 20456564 is about 273.4917496651.

The spelling of 20456564 in words is "twenty million, four hundred fifty-six thousand, five hundred sixty-four".