15800020931 has 6 divisors (see below), whose sum is σ = 16675368732. Its totient is φ = 14968440540.

The previous prime is 15800020891. The next prime is 15800020933. The reversal of 15800020931 is 13902000851.

It is a de Polignac number, because none of the positive numbers 2^k-15800020931 is a prime.

It is a super-2 number, since 2×15800020931² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 15800020894 and 15800020903.

It is not an unprimeable number, because it can be changed into a prime (15800020933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 21883325 + ... + 21884046.

It is an arithmetic number, because the mean of its divisors is an integer number (2779228122).

Almost surely, 2^15800020931 is an apocalyptic number.

15800020931 is a deficient number, since it is larger than the sum of its proper divisors (875347801).

15800020931 is an equidigital number, since it uses as much as digits as its factorization.

15800020931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43767409 (or 43767390 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 29.

The spelling of 15800020931 in words is "fifteen billion, eight hundred million, twenty thousand, nine hundred thirty-one".