20388474 has 24 divisors (see below), whose sum is σ = 46774260. Its totient is φ = 6396288.

The previous prime is 20388469. The next prime is 20388481. The reversal of 20388474 is 47488302.

It can be written as a sum of positive squares in 2 ways, for example, as 20385225 + 3249 = 4515^2 + 57^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33009 + ... + 33620.

Almost surely, 2^20388474 is an apocalyptic number.

20388474 is an abundant number, since it is smaller than the sum of its proper divisors (26385786).

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

20388474 is a wasteful number, since it uses less digits than its factorization.

20388474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66654 (or 66651 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 36.

The square root of 20388474 is about 4515.3597863293. The cubic root of 20388474 is about 273.1879718199.

The spelling of 20388474 in words is "twenty million, three hundred eighty-eight thousand, four hundred seventy-four".