23131222020 has 72 divisors (see below), whose sum is σ = 71657599104. Its totient is φ = 6037082688.

The previous prime is 23131222007. The next prime is 23131222033. The reversal of 23131222020 is 2022213132.

It is an interprime number because it is at equal distance from previous prime (23131222007) and next prime (23131222033).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 23131221984 and 23131222002.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1358634 + ... + 1375553.

It is an arithmetic number, because the mean of its divisors is an integer number (995244432).

Almost surely, 2^23131222020 is an apocalyptic number.

23131222020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23131222020 is an abundant number, since it is smaller than the sum of its proper divisors (48526377084).

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

23131222020 is a wasteful number, since it uses less digits than its factorization.

23131222020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2734249 (or 2734244 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 23131222020 its reverse (2022213132), we get a palindrome (25153435152).

The spelling of 23131222020 in words is "twenty-three billion, one hundred thirty-one million, two hundred twenty-two thousand, twenty".