23437216520 has 64 divisors (see below), whose sum is σ = 54867942000. Its totient is φ = 8999216128.

The previous prime is 23437216477. The next prime is 23437216541. The reversal of 23437216520 is 2561273432.

It can be written as a sum of positive squares in 8 ways, for example, as 7673409604 + 15763806916 = 87598^2 + 125554^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 142286 + ... + 259074.

Almost surely, 2^23437216520 is an apocalyptic number.

23437216520 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 23437216520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27433971000).

23437216520 is an abundant number, since it is smaller than the sum of its proper divisors (31430725480).

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

23437216520 is a wasteful number, since it uses less digits than its factorization.

23437216520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117002 (or 116998 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 35.

Adding to 23437216520 its reverse (2561273432), we get a palindrome (25998489952).

The spelling of 23437216520 in words is "twenty-three billion, four hundred thirty-seven million, two hundred sixteen thousand, five hundred twenty".