12013431320 has 128 divisors (see below), whose sum is σ = 30721420800. Its totient is φ = 4189363200.

The previous prime is 12013431319. The next prime is 12013431343. The reversal of 12013431320 is 2313431021.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 12013431292 and 12013431301.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1058717 + ... + 1070003.

It is an arithmetic number, because the mean of its divisors is an integer number (240011100).

Almost surely, 2^12013431320 is an apocalyptic number.

12013431320 is a gapful number since it is divisible by the number (10) 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 12013431320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15360710400).

12013431320 is an abundant number, since it is smaller than the sum of its proper divisors (18707989480).

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

12013431320 is a wasteful number, since it uses less digits than its factorization.

12013431320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11409 (or 11405 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 12013431320 its reverse (2313431021), we get a palindrome (14326862341).

The spelling of 12013431320 in words is "twelve billion, thirteen million, four hundred thirty-one thousand, three hundred twenty".