20111100920 has 16 divisors (see below), whose sum is σ = 45249977160. Its totient is φ = 8044440352.

The previous prime is 20111100899. The next prime is 20111100973. The reversal of 20111100920 is 2900111102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 251388722 + ... + 251388801.

Almost surely, 2^20111100920 is an apocalyptic number.

20111100920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20111100920 is an abundant number, since it is smaller than the sum of its proper divisors (25138876240).

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

20111100920 is a wasteful number, since it uses less digits than its factorization.

20111100920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 502777534 (or 502777530 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 17.

The spelling of 20111100920 in words is "twenty billion, one hundred eleven million, one hundred thousand, nine hundred twenty".