19993931904 has 32 divisors (see below), whose sum is σ = 53108882640. Its totient is φ = 6664643840.

The previous prime is 19993931899. The next prime is 19993931927. The reversal of 19993931904 is 40913939991.

It is a tau number, because it is divible by the number of its divisors (32).

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, 26033382 + ... + 26034149.

Almost surely, 2^19993931904 is an apocalyptic number.

It is an amenable number.

19993931904 is an abundant number, since it is smaller than the sum of its proper divisors (33114950736).

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

19993931904 is an equidigital number, since it uses as much as digits as its factorization.

19993931904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52067548 (or 52067536 counting only the distinct ones).

The product of its (nonzero) digits is 2125764, while the sum is 57.

The spelling of 19993931904 in words is "nineteen billion, nine hundred ninety-three million, nine hundred thirty-one thousand, nine hundred four".