23831220 has 96 divisors (see below), whose sum is σ = 79607808. Its totient is φ = 5208192.

The previous prime is 23831207. The next prime is 23831231. The reversal of 23831220 is 2213832.

23831220 = 231² + 232² + ... + 437².

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8427 + ... + 10893.

It is an arithmetic number, because the mean of its divisors is an integer number (829248).

Almost surely, 2^23831220 is an apocalyptic number.

23831220 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 23831220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39803904).

23831220 is an abundant number, since it is smaller than the sum of its proper divisors (55776588).

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

23831220 is a wasteful number, since it uses less digits than its factorization.

23831220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2509 (or 2507 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 23831220 is about 4881.7230564627. The cubic root of 23831220 is about 287.7721480999.

The spelling of 23831220 in words is "twenty-three million, eight hundred thirty-one thousand, two hundred twenty".