13123431320 has 16 divisors (see below), whose sum is σ = 29527720560. Its totient is φ = 5249372512.

The previous prime is 13123431317. The next prime is 13123431341. The reversal of 13123431320 is 2313432131.

It is a super-2 number, since 2×13123431320² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 164042852 + ... + 164042931.

It is an arithmetic number, because the mean of its divisors is an integer number (1845482535).

Almost surely, 2^13123431320 is an apocalyptic number.

13123431320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13123431320 is an abundant number, since it is smaller than the sum of its proper divisors (16404289240).

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

13123431320 is a wasteful number, since it uses less digits than its factorization.

13123431320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328085794 (or 328085790 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 13123431320 its reverse (2313432131), we get a palindrome (15436863451).

The spelling of 13123431320 in words is "thirteen billion, one hundred twenty-three million, four hundred thirty-one thousand, three hundred twenty".