20704928 has 24 divisors (see below), whose sum is σ = 41150592. Its totient is φ = 10254016.

The previous prime is 20704921. The next prime is 20704933. The reversal of 20704928 is 82940702.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 20704894 and 20704903.

It is not an unprimeable number, because it can be changed into a prime (20704921) 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, 401 + ... + 6447.

It is an arithmetic number, because the mean of its divisors is an integer number (1714608).

Almost surely, 2^20704928 is an apocalyptic number.

It is an amenable number.

20704928 is a deficient number, since it is larger than the sum of its proper divisors (20445664).

20704928 is a wasteful number, since it uses less digits than its factorization.

20704928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6164 (or 6156 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 20704928 is about 4550.2668053643. The cubic root of 20704928 is about 274.5941252277.

The spelling of 20704928 in words is "twenty million, seven hundred four thousand, nine hundred twenty-eight".