13199920 has 20 divisors (see below), whose sum is σ = 30690000. Its totient is φ = 5279936.

The previous prime is 13199917. The next prime is 13199929. The reversal of 13199920 is 2999131.

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

It is not an unprimeable number, because it can be changed into a prime (13199929) 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, 82420 + ... + 82579.

It is an arithmetic number, because the mean of its divisors is an integer number (1534500).

Almost surely, 2^13199920 is an apocalyptic number.

13199920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13199920 is an abundant number, since it is smaller than the sum of its proper divisors (17490080).

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

13199920 is a wasteful number, since it uses less digits than its factorization.

13199920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165012 (or 165006 counting only the distinct ones).

The product of its (nonzero) digits is 4374, while the sum is 34.

The square root of 13199920 is about 3633.1694152627. The cubic root of 13199920 is about 236.3326726518.

The spelling of 13199920 in words is "thirteen million, one hundred ninety-nine thousand, nine hundred twenty".