20564370 has 48 divisors (see below), whose sum is σ = 54781272. Its totient is φ = 5349120.

The previous prime is 20564359. The next prime is 20564387. The reversal of 20564370 is 7346502.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 5377761 + 15186609 = 2319^2 + 3897^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 904 + ... + 6476.

Almost surely, 2^20564370 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20564370, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27390636).

20564370 is an abundant number, since it is smaller than the sum of its proper divisors (34216902).

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

20564370 is a wasteful number, since it uses less digits than its factorization.

20564370 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5627 (or 5624 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 27.

The square root of 20564370 is about 4534.7954749911. The cubic root of 20564370 is about 273.9713415957.

The spelling of 20564370 in words is "twenty million, five hundred sixty-four thousand, three hundred seventy".