20311123112 has 32 divisors (see below), whose sum is σ = 43649305920. Its totient is φ = 8679672960.

The previous prime is 20311123109. The next prime is 20311123159. The reversal of 20311123112 is 21132111302.

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, 503189 + ... + 542052.

It is an arithmetic number, because the mean of its divisors is an integer number (1364040810).

Almost surely, 2^20311123112 is an apocalyptic number.

It is an amenable number.

20311123112 is an abundant number, since it is smaller than the sum of its proper divisors (23338182808).

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

20311123112 is a wasteful number, since it uses less digits than its factorization.

20311123112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1045601 (or 1045597 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 20311123112 its reverse (21132111302), we get a palindrome (41443234414).

The spelling of 20311123112 in words is "twenty billion, three hundred eleven million, one hundred twenty-three thousand, one hundred twelve".