23131103220 has 144 divisors (see below), whose sum is σ = 75577162752. Its totient is φ = 5709749760.

The previous prime is 23131103137. The next prime is 23131103263. The reversal of 23131103220 is 2230113132.

23131103220 is a `hidden beast` number, since 2 + 31 + 311 + 0 + 322 + 0 = 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 = 23131103193 and 23131103202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 38224 + ... + 218456.

It is an arithmetic number, because the mean of its divisors is an integer number (524841408).

Almost surely, 2^23131103220 is an apocalyptic number.

23131103220 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 23131103220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37788581376).

23131103220 is an abundant number, since it is smaller than the sum of its proper divisors (52446059532).

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

23131103220 is a wasteful number, since it uses less digits than its factorization.

23131103220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180302 (or 180297 counting only the distinct ones).

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

Adding to 23131103220 its reverse (2230113132), we get a palindrome (25361216352).

The spelling of 23131103220 in words is "twenty-three billion, one hundred thirty-one million, one hundred three thousand, two hundred twenty".