20931112908 has 48 divisors (see below), whose sum is σ = 54291656160. Its totient is φ = 6973719552.

The previous prime is 20931112907. The next prime is 20931112949. The reversal of 20931112908 is 80921113902.

It is a super-2 number, since 2×20931112908² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (20931112907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 187516 + ... + 277532.

It is an arithmetic number, because the mean of its divisors is an integer number (1131076170).

Almost surely, 2^20931112908 is an apocalyptic number.

It is an amenable number.

20931112908 is an abundant number, since it is smaller than the sum of its proper divisors (33360543252).

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

20931112908 is a wasteful number, since it uses less digits than its factorization.

20931112908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92183 (or 92175 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 36.

The spelling of 20931112908 in words is "twenty billion, nine hundred thirty-one million, one hundred twelve thousand, nine hundred eight".