19877995984 has 80 divisors (see below), whose sum is σ = 48923118720. Its totient is φ = 7598522880.

The previous prime is 19877995979. The next prime is 19877995999. The reversal of 19877995984 is 48959977891.

It is a self number, because there is not a number n which added to its sum of digits gives 19877995984.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 86919 + ... + 217510.

It is an arithmetic number, because the mean of its divisors is an integer number (611538984).

Almost surely, 2^19877995984 is an apocalyptic number.

19877995984 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

19877995984 is an abundant number, since it is smaller than the sum of its proper divisors (29045122736).

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

19877995984 is a wasteful number, since it uses less digits than its factorization.

19877995984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304508 (or 304502 counting only the distinct ones).

The product of its digits is 411505920, while the sum is 76.

The spelling of 19877995984 in words is "nineteen billion, eight hundred seventy-seven million, nine hundred ninety-five thousand, nine hundred eighty-four".