13557720 has 64 divisors (see below), whose sum is σ = 44375040. Its totient is φ = 3286400.

The previous prime is 13557707. The next prime is 13557727. The reversal of 13557720 is 2775531.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13557727) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3816 + ... + 6455.

It is an arithmetic number, because the mean of its divisors is an integer number (693360).

Almost surely, 2^13557720 is an apocalyptic number.

13557720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13557720 is an abundant number, since it is smaller than the sum of its proper divisors (30817320).

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

13557720 is a wasteful number, since it uses less digits than its factorization.

13557720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10296 (or 10292 counting only the distinct ones).

The product of its (nonzero) digits is 7350, while the sum is 30.

The square root of 13557720 is about 3682.0809333854. The cubic root of 13557720 is about 238.4490263720.

The spelling of 13557720 in words is "thirteen million, five hundred fifty-seven thousand, seven hundred twenty".