13565820 has 48 divisors (see below), whose sum is σ = 38158848. Its totient is φ = 3600960.

The previous prime is 13565807. The next prime is 13565831. The reversal of 13565820 is 2856531.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18297 + ... + 19023.

It is an arithmetic number, because the mean of its divisors is an integer number (794976).

Almost surely, 2^13565820 is an apocalyptic number.

13565820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13565820 is an abundant number, since it is smaller than the sum of its proper divisors (24593028).

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

13565820 is a wasteful number, since it uses less digits than its factorization.

13565820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1050 (or 1048 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 13565820 is about 3683.1806906531. The cubic root of 13565820 is about 238.4965036911.

The spelling of 13565820 in words is "thirteen million, five hundred sixty-five thousand, eight hundred twenty".