20560864 has 12 divisors (see below), whose sum is σ = 40479264. Its totient is φ = 10280416.

The previous prime is 20560853. The next prime is 20560867. The reversal of 20560864 is 46806502.

20560864 = 535² + 536² + ... + 598².

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20560867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321232 + ... + 321295.

It is an arithmetic number, because the mean of its divisors is an integer number (3373272).

Almost surely, 2^20560864 is an apocalyptic number.

It is an amenable number.

20560864 is a deficient number, since it is larger than the sum of its proper divisors (19918400).

20560864 is an equidigital number, since it uses as much as digits as its factorization.

20560864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 642537 (or 642529 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 20560864 is about 4534.4088920167. The cubic root of 20560864 is about 273.9557710058.

The spelling of 20560864 in words is "twenty million, five hundred sixty thousand, eight hundred sixty-four".