23013231220 has 144 divisors (see below), whose sum is σ = 56841393168. Its totient is φ = 7803371520.

The previous prime is 23013231217. The next prime is 23013231277. The reversal of 23013231220 is 2213231032.

It can be written as a sum of positive squares in 8 ways, for example, as 2537338384 + 20475892836 = 50372^2 + 143094^2 .

It is a super-2 number, since 2×23013231220² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 53148124 + ... + 53148556.

It is an arithmetic number, because the mean of its divisors is an integer number (394731897).

Almost surely, 2^23013231220 is an apocalyptic number.

23013231220 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 23013231220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28420696584).

23013231220 is an abundant number, since it is smaller than the sum of its proper divisors (33828161948).

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

23013231220 is a wasteful number, since it uses less digits than its factorization.

23013231220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 930 (or 921 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 23013231220 its reverse (2213231032), we get a palindrome (25226462252).

The spelling of 23013231220 in words is "twenty-three billion, thirteen million, two hundred thirty-one thousand, two hundred twenty".