20465564 has 12 divisors (see below), whose sum is σ = 40931184. Its totient is φ = 8770944.

The previous prime is 20465563. The next prime is 20465587. The reversal of 20465564 is 46556402.

20465564 is an admirable number.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 20465564.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20465563) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 365429 + ... + 365484.

It is an arithmetic number, because the mean of its divisors is an integer number (3410932).

Almost surely, 2^20465564 is an apocalyptic number.

It is an amenable number.

20465564 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20465564 is a wasteful number, since it uses less digits than its factorization.

20465564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 730924 (or 730922 counting only the distinct ones).

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

The square root of 20465564 is about 4523.8881506952. Note that the first 3 decimals coincide. The cubic root of 20465564 is about 273.5318519498.

The spelling of 20465564 in words is "twenty million, four hundred sixty-five thousand, five hundred sixty-four".