19987596808 has 64 divisors (see below), whose sum is σ = 38754806400. Its totient is φ = 9660188160.

The previous prime is 19987596743. The next prime is 19987596809. The reversal of 19987596808 is 80869578991.

It is not an unprimeable number, because it can be changed into a prime (19987596809) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7420710 + ... + 7423402.

It is an arithmetic number, because the mean of its divisors is an integer number (605543850).

Almost surely, 2^19987596808 is an apocalyptic number.

It is an amenable number.

19987596808 is a deficient number, since it is larger than the sum of its proper divisors (18767209592).

19987596808 is a wasteful number, since it uses less digits than its factorization.

19987596808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3022 (or 3018 counting only the distinct ones).

The product of its (nonzero) digits is 78382080, while the sum is 70.

The spelling of 19987596808 in words is "nineteen billion, nine hundred eighty-seven million, five hundred ninety-six thousand, eight hundred eight".