19887423696 has 80 divisors (see below), whose sum is σ = 65239177600. Its totient is φ = 5682120192.

The previous prime is 19887423637. The next prime is 19887423719. The reversal of 19887423696 is 69632478891.

19887423696 is a `hidden beast` number, since 198 + 87 + 4 + 2 + 369 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

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, 3285241 + ... + 3291288.

It is an arithmetic number, because the mean of its divisors is an integer number (815489720).

Almost surely, 2^19887423696 is an apocalyptic number.

19887423696 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

19887423696 is an abundant number, since it is smaller than the sum of its proper divisors (45351753904).

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

19887423696 is a wasteful number, since it uses less digits than its factorization.

19887423696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6576553 (or 6576541 counting only the distinct ones).

The product of its digits is 31352832, while the sum is 63.

The spelling of 19887423696 in words is "nineteen billion, eight hundred eighty-seven million, four hundred twenty-three thousand, six hundred ninety-six".