13680920 has 128 divisors (see below), whose sum is σ = 37324800. Its totient is φ = 4454400.

The previous prime is 13680911. The next prime is 13680941. The reversal of 13680920 is 2908631.

13680920 = T₆₁ + T₆₂ + ... + T₄₃₄.

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, 231851 + ... + 231909.

It is an arithmetic number, because the mean of its divisors is an integer number (291600).

Almost surely, 2^13680920 is an apocalyptic number.

13680920 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 13680920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18662400).

13680920 is an abundant number, since it is smaller than the sum of its proper divisors (23643880).

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

13680920 is a wasteful number, since it uses less digits than its factorization.

13680920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129 (or 125 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 13680920 is about 3698.7727694466. The cubic root of 13680920 is about 239.1691175366.

The spelling of 13680920 in words is "thirteen million, six hundred eighty thousand, nine hundred twenty".