20513870804 has 24 divisors (see below), whose sum is σ = 41700331008. Its totient is φ = 8647532640.

The previous prime is 20513870801. The next prime is 20513870827. The reversal of 20513870804 is 40807831502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20513870801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6003524 + ... + 6006939.

It is an arithmetic number, because the mean of its divisors is an integer number (1737513792).

Almost surely, 2^20513870804 is an apocalyptic number.

It is an amenable number.

20513870804 is an abundant number, since it is smaller than the sum of its proper divisors (21186460204).

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

20513870804 is a wasteful number, since it uses less digits than its factorization.

20513870804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12010535 (or 12010533 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 38.

The spelling of 20513870804 in words is "twenty billion, five hundred thirteen million, eight hundred seventy thousand, eight hundred four".