23515555220 has 24 divisors (see below), whose sum is σ = 49413198408. Its totient is φ = 9400406400.

The previous prime is 23515555187. The next prime is 23515555223. The reversal of 23515555220 is 2255551532.

It can be written as a sum of positive squares in 4 ways, for example, as 500237956 + 23015317264 = 22366^2 + 151708^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23515555223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 330251 + ... + 395090.

It is an arithmetic number, because the mean of its divisors is an integer number (2058883267).

Almost surely, 2^23515555220 is an apocalyptic number.

23515555220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23515555220 is an abundant number, since it is smaller than the sum of its proper divisors (25897643188).

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

23515555220 is a wasteful number, since it uses less digits than its factorization.

23515555220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 726971 (or 726969 counting only the distinct ones).

The product of its (nonzero) digits is 75000, while the sum is 35.

The spelling of 23515555220 in words is "twenty-three billion, five hundred fifteen million, five hundred fifty-five thousand, two hundred twenty".