20831975199 has 144 divisors (see below), whose sum is σ = 37268719488. Its totient is φ = 11591512128.

The previous prime is 20831975189. The next prime is 20831975239. The reversal of 20831975199 is 99157913802.

20831975199 is a `hidden beast` number, since 2 + 0 + 8 + 31 + 97 + 519 + 9 = 666.

It is not a de Polignac number, because 20831975199 - 2⁹ = 20831974687 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20831975189) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 105745969 + ... + 105746165.

It is an arithmetic number, because the mean of its divisors is an integer number (258810552).

Almost surely, 2^20831975199 is an apocalyptic number.

20831975199 is a deficient number, since it is larger than the sum of its proper divisors (16436744289).

20831975199 is a wasteful number, since it uses less digits than its factorization.

20831975199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 416 (or 397 counting only the distinct ones).

The product of its (nonzero) digits is 1224720, while the sum is 54.

The spelling of 20831975199 in words is "twenty billion, eight hundred thirty-one million, nine hundred seventy-five thousand, one hundred ninety-nine".