19900375631256 has 32 divisors (see below), whose sum is σ = 49812435961200. Its totient is φ = 6625258959360.

The previous prime is 19900375631243. The next prime is 19900375631329. The reversal of 19900375631256 is 65213657300991.

It is a junction number, because it is equal to n+sod(n) for n = 19900375631196 and 19900375631205.

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, 512454205 + ... + 512493036.

Almost surely, 2^{19900375631256} is an apocalyptic number.

It is an amenable number.

19900375631256 is an abundant number, since it is smaller than the sum of its proper divisors (29912060329944).

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

19900375631256 is a wasteful number, since it uses less digits than its factorization.

19900375631256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1024948059 (or 1024948055 counting only the distinct ones).

The product of its (nonzero) digits is 9185400, while the sum is 57.

The spelling of 19900375631256 in words is "nineteen trillion, nine hundred billion, three hundred seventy-five million, six hundred thirty-one thousand, two hundred fifty-six".