13312720 has 20 divisors (see below), whose sum is σ = 30952260. Its totient is φ = 5325056.

The previous prime is 13312693. The next prime is 13312723. The reversal of 13312720 is 2721331.

It can be written as a sum of positive squares in 2 ways, for example, as 2396304 + 10916416 = 1548^2 + 3304^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13312723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83125 + ... + 83284.

It is an arithmetic number, because the mean of its divisors is an integer number (1547613).

Almost surely, 2^13312720 is an apocalyptic number.

13312720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13312720 is an abundant number, since it is smaller than the sum of its proper divisors (17639540).

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

13312720 is a wasteful number, since it uses less digits than its factorization.

13312720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166422 (or 166416 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 19.

The square root of 13312720 is about 3648.6600280103. The cubic root of 13312720 is about 237.0039582264.

The spelling of 13312720 in words is "thirteen million, three hundred twelve thousand, seven hundred twenty".