23012431220 has 12 divisors (see below), whose sum is σ = 48326105604. Its totient is φ = 9204972480.

The previous prime is 23012431199. The next prime is 23012431313. The reversal of 23012431220 is 2213421032.

It can be written as a sum of positive squares in 2 ways, for example, as 4063807504 + 18948623716 = 63748^2 + 137654^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 1150621561 = 23012431220 / (2 + 3 + 0 + 1 + 2 + 4 + 3 + 1 + 2 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 23012431192 and 23012431201.

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, 575310761 + ... + 575310800.

It is an arithmetic number, because the mean of its divisors is an integer number (4027175467).

Almost surely, 2^23012431220 is an apocalyptic number.

23012431220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23012431220 is an abundant number, since it is smaller than the sum of its proper divisors (25313674384).

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

23012431220 is a wasteful number, since it uses less digits than its factorization.

23012431220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1150621570 (or 1150621568 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 23012431220 its reverse (2213421032), we get a palindrome (25225852252).

The spelling of 23012431220 in words is "twenty-three billion, twelve million, four hundred thirty-one thousand, two hundred twenty".