23131320 has 64 divisors (see below), whose sum is σ = 70722720. Its totient is φ = 6050304.

The previous prime is 23131289. The next prime is 23131333. The reversal of 23131320 is 2313132.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 23131320.

It is a congruent number.

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, 4542 + ... + 8178.

Almost surely, 2^23131320 is an apocalyptic number.

23131320 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 23131320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35361360).

23131320 is an abundant number, since it is smaller than the sum of its proper divisors (47591400).

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

23131320 is a wasteful number, since it uses less digits than its factorization.

23131320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3704 (or 3700 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 15.

The square root of 23131320 is about 4809.5030928361. The cubic root of 23131320 is about 284.9269126221.

Adding to 23131320 its reverse (2313132), we get a palindrome (25444452).

The spelling of 23131320 in words is "twenty-three million, one hundred thirty-one thousand, three hundred twenty".