23131311220 has 24 divisors (see below), whose sum is σ = 48579093864. Its totient is φ = 9251888256.

The previous prime is 23131311143. The next prime is 23131311223. The reversal of 23131311220 is 2211313132.

It can be written as a sum of positive squares in 4 ways, for example, as 169364196 + 22961947024 = 13014^2 + 151532^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23131311223) 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 7 ways as a sum of consecutive naturals, for example, 352954 + ... + 413326.

It is an arithmetic number, because the mean of its divisors is an integer number (2024128911).

Almost surely, 2^23131311220 is an apocalyptic number.

23131311220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23131311220 is an abundant number, since it is smaller than the sum of its proper divisors (25447782644).

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

23131311220 is a wasteful number, since it uses less digits than its factorization.

23131311220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79539 (or 79537 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 23131311220 its reverse (2211313132), we get a palindrome (25342624352).

It can be divided in two parts, 231313112 and 20, that added together give a palindrome (231313132).

The spelling of 23131311220 in words is "twenty-three billion, one hundred thirty-one million, three hundred eleven thousand, two hundred twenty".