19900597632 has 64 divisors (see below), whose sum is σ = 52893434160. Its totient is φ = 6629457920.

The previous prime is 19900597631. The next prime is 19900597693. The reversal of 19900597632 is 23679500991.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×19900597632² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19900597631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 645808 + ... + 675920.

Almost surely, 2^19900597632 is an apocalyptic number.

19900597632 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

19900597632 is an abundant number, since it is smaller than the sum of its proper divisors (32992836528).

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

19900597632 is a wasteful number, since it uses less digits than its factorization.

19900597632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31851 (or 31839 counting only the distinct ones).

The product of its (nonzero) digits is 918540, while the sum is 51.

The spelling of 19900597632 in words is "nineteen billion, nine hundred million, five hundred ninety-seven thousand, six hundred thirty-two".