19987077996 has 48 divisors (see below), whose sum is σ = 51878915200. Its totient is φ = 6654572496.

The previous prime is 19987077983. The next prime is 19987078091. The reversal of 19987077996 is 69977078991.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14950 + ... + 200493.

Almost surely, 2^19987077996 is an apocalyptic number.

It is an amenable number.

19987077996 is an abundant number, since it is smaller than the sum of its proper divisors (31891837204).

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

19987077996 is a wasteful number, since it uses less digits than its factorization.

19987077996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216315 (or 216307 counting only the distinct ones).

The product of its (nonzero) digits is 108020304, while the sum is 72.

The spelling of 19987077996 in words is "nineteen billion, nine hundred eighty-seven million, seventy-seven thousand, nine hundred ninety-six".