20973904 has 40 divisors (see below), whose sum is σ = 46657728. Its totient is φ = 8947200.

The previous prime is 20973893. The next prime is 20973913. The reversal of 20973904 is 40937902.

It is a self number, because there is not a number n which added to its sum of digits gives 20973904.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44679 + ... + 45145.

Almost surely, 2^20973904 is an apocalyptic number.

It is an amenable number.

20973904 is an abundant number, since it is smaller than the sum of its proper divisors (25683824).

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

20973904 is a wasteful number, since it uses less digits than its factorization.

20973904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 883 (or 877 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 34.

The square root of 20973904 is about 4579.7275028106. The cubic root of 20973904 is about 275.7780894974.

The spelling of 20973904 in words is "twenty million, nine hundred seventy-three thousand, nine hundred four".