13231320 has 32 divisors (see below), whose sum is σ = 39694320. Its totient is φ = 3528320.

The previous prime is 13231319. The next prime is 13231331. The reversal of 13231320 is 2313231.

13231320 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

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 13231320.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55011 + ... + 55250.

Almost surely, 2^13231320 is an apocalyptic number.

13231320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13231320 is an abundant number, since it is smaller than the sum of its proper divisors (26463000).

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

13231320 is a wasteful number, since it uses less digits than its factorization.

13231320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110275 (or 110271 counting only the distinct ones).

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

The square root of 13231320 is about 3637.4881443106. The cubic root of 13231320 is about 236.5199204898.

Adding to 13231320 its reverse (2313231), we get a palindrome (15544551).

The spelling of 13231320 in words is "thirteen million, two hundred thirty-one thousand, three hundred twenty".