19647600920 has 32 divisors (see below), whose sum is σ = 45731487600. Its totient is φ = 7588038528.

The previous prime is 19647600919. The next prime is 19647600943. The reversal of 19647600920 is 2900674691.

It is a super-4 number, since 4×19647600920⁴ (a number of 42 digits) contains 4444 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8467634 + ... + 8469953.

Almost surely, 2^19647600920 is an apocalyptic number.

19647600920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19647600920 is an abundant number, since it is smaller than the sum of its proper divisors (26083886680).

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

19647600920 is a wasteful number, since it uses less digits than its factorization.

19647600920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16937627 (or 16937623 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 44.

The spelling of 19647600920 in words is "nineteen billion, six hundred forty-seven million, six hundred thousand, nine hundred twenty".