20566920 has 64 divisors (see below), whose sum is σ = 67314240. Its totient is φ = 4985600.

The previous prime is 20566913. The next prime is 20566951. The reversal of 20566920 is 2966502.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6471 + ... + 9110.

It is an arithmetic number, because the mean of its divisors is an integer number (1051785).

Almost surely, 2^20566920 is an apocalyptic number.

20566920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20566920 is an abundant number, since it is smaller than the sum of its proper divisors (46747320).

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

20566920 is a wasteful number, since it uses less digits than its factorization.

20566920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15606 (or 15602 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 20566920 is about 4535.0766255930. The cubic root of 20566920 is about 273.9826653569.

The spelling of 20566920 in words is "twenty million, five hundred sixty-six thousand, nine hundred twenty".