19656512920 has 48 divisors (see below), whose sum is σ = 48613330080. Its totient is φ = 7147821120.

The previous prime is 19656512917. The next prime is 19656512933. The reversal of 19656512920 is 2921565691.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2025792 + ... + 2035471.

It is an arithmetic number, because the mean of its divisors is an integer number (1012777710).

Almost surely, 2^19656512920 is an apocalyptic number.

19656512920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19656512920 is an abundant number, since it is smaller than the sum of its proper divisors (28956817160).

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

19656512920 is a wasteful number, since it uses less digits than its factorization.

19656512920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4061296 (or 4061281 counting only the distinct ones).

The product of its (nonzero) digits is 291600, while the sum is 46.

The spelling of 19656512920 in words is "nineteen billion, six hundred fifty-six million, five hundred twelve thousand, nine hundred twenty".