23513115220 has 96 divisors (see below), whose sum is σ = 59606265600. Its totient is φ = 7611024384.

The previous prime is 23513115217. The next prime is 23513115229. The reversal of 23513115220 is 2251131532.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23513115229) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 764296 + ... + 794464.

It is an arithmetic number, because the mean of its divisors is an integer number (620898600).

Almost surely, 2^23513115220 is an apocalyptic number.

23513115220 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 23513115220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29803132800).

23513115220 is an abundant number, since it is smaller than the sum of its proper divisors (36093150380).

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

23513115220 is a wasteful number, since it uses less digits than its factorization.

23513115220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30497 (or 30495 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 25.

Adding to 23513115220 its reverse (2251131532), we get a palindrome (25764246752).

The spelling of 23513115220 in words is "twenty-three billion, five hundred thirteen million, one hundred fifteen thousand, two hundred twenty".