19994911872 has 96 divisors (see below), whose sum is σ = 57511439280. Its totient is φ = 6152260608.

The previous prime is 19994911829. The next prime is 19994911891. The reversal of 19994911872 is 27811949991.

It is a tau number, because it is divible by the number of its divisors (96).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 89158 + ... + 218949.

Almost surely, 2^19994911872 is an apocalyptic number.

19994911872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

19994911872 is an abundant number, since it is smaller than the sum of its proper divisors (37516527408).

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

19994911872 is a wasteful number, since it uses less digits than its factorization.

19994911872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308150 (or 308125 counting only the distinct ones).

The product of its digits is 2939328, while the sum is 60.

The spelling of 19994911872 in words is "nineteen billion, nine hundred ninety-four million, nine hundred eleven thousand, eight hundred seventy-two".