19953439632 has 60 divisors (see below), whose sum is σ = 63819337920. Its totient is φ = 5700982464.

The previous prime is 19953439613. The next prime is 19953439657. The reversal of 19953439632 is 23693435991.

19953439632 is a `hidden beast` number, since 19 + 9 + 534 + 3 + 96 + 3 + 2 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9896532 + ... + 9898547.

It is an arithmetic number, because the mean of its divisors is an integer number (1063655632).

Almost surely, 2^19953439632 is an apocalyptic number.

19953439632 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

19953439632 is an abundant number, since it is smaller than the sum of its proper divisors (43865898288).

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

19953439632 is a wasteful number, since it uses less digits than its factorization.

19953439632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19795100 (or 19795091 counting only the distinct ones).

The product of its digits is 4723920, while the sum is 54.

The spelling of 19953439632 in words is "nineteen billion, nine hundred fifty-three million, four hundred thirty-nine thousand, six hundred thirty-two".