20491038304 has 36 divisors (see below), whose sum is σ = 44342572932. Its totient is φ = 9314106560.

The previous prime is 20491038263. The next prime is 20491038367. The reversal of 20491038304 is 40383019402.

It is a self number, because there is not a number n which added to its sum of digits gives 20491038304.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2642182 + ... + 2649925.

It is an arithmetic number, because the mean of its divisors is an integer number (1231738137).

Almost surely, 2^20491038304 is an apocalyptic number.

It is an amenable number.

20491038304 is an abundant number, since it is smaller than the sum of its proper divisors (23851534628).

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

20491038304 is a wasteful number, since it uses less digits than its factorization.

20491038304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5292139 (or 5292120 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 34.

The spelling of 20491038304 in words is "twenty billion, four hundred ninety-one million, thirty-eight thousand, three hundred four".