19886973688 has 16 divisors (see below), whose sum is σ = 37581684480. Its totient is φ = 9865191168.

The previous prime is 19886973679. The next prime is 19886973703. The reversal of 19886973688 is 88637968891.

It is a self number, because there is not a number n which added to its sum of digits gives 19886973688.

It is a congruent number.

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, 9785881 + ... + 9787912.

It is an arithmetic number, because the mean of its divisors is an integer number (2348855280).

Almost surely, 2^19886973688 is an apocalyptic number.

It is an amenable number.

19886973688 is a deficient number, since it is larger than the sum of its proper divisors (17694710792).

19886973688 is a wasteful number, since it uses less digits than its factorization.

19886973688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19573926 (or 19573922 counting only the distinct ones).

The product of its digits is 250822656, while the sum is 73.

The spelling of 19886973688 in words is "nineteen billion, eight hundred eighty-six million, nine hundred seventy-three thousand, six hundred eighty-eight".