20638792 has 16 divisors (see below), whose sum is σ = 38761200. Its totient is φ = 10302480.

The previous prime is 20638789. The next prime is 20638811. The reversal of 20638792 is 29783602.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4167 + ... + 7657.

It is an arithmetic number, because the mean of its divisors is an integer number (2422575).

Almost surely, 2^20638792 is an apocalyptic number.

It is an amenable number.

20638792 is a deficient number, since it is larger than the sum of its proper divisors (18122408).

20638792 is a wasteful number, since it uses less digits than its factorization.

20638792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4236 (or 4232 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 20638792 is about 4542.9937266080. The cubic root of 20638792 is about 274.3014424471.

The spelling of 20638792 in words is "twenty million, six hundred thirty-eight thousand, seven hundred ninety-two".