23131130220 has 288 divisors, whose sum is σ = 80018003520. Its totient is φ = 5357076480.

The previous prime is 23131130219. The next prime is 23131130227. The reversal of 23131130220 is 2203113132.

23131130220 is a `hidden beast` number, since 2 + 31 + 311 + 302 + 20 = 666.

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 = 23131130193 and 23131130202.

It is not an unprimeable number, because it can be changed into a prime (23131130227) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 5567664 + ... + 5571816.

It is an arithmetic number, because the mean of its divisors is an integer number (277840290).

Almost surely, 2^23131130220 is an apocalyptic number.

23131130220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 23131130220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40009001760).

23131130220 is an abundant number, since it is smaller than the sum of its proper divisors (56886873300).

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

23131130220 is a wasteful number, since it uses less digits than its factorization.

23131130220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4305 (or 4300 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 23131130220 its reverse (2203113132), we get a palindrome (25334243352).

It can be divided in two parts, 23131 and 130220, that added together give a palindrome (153351).

The spelling of 23131130220 in words is "twenty-three billion, one hundred thirty-one million, one hundred thirty thousand, two hundred twenty".