13565620 has 48 divisors (see below), whose sum is σ = 31046400. Its totient is φ = 4959360.

The previous prime is 13565611. The next prime is 13565627. The reversal of 13565620 is 2656531.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13565627) 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, 10405 + ... + 11635.

It is an arithmetic number, because the mean of its divisors is an integer number (646800).

Almost surely, 2^13565620 is an apocalyptic number.

13565620 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 13565620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15523200).

13565620 is an abundant number, since it is smaller than the sum of its proper divisors (17480780).

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

13565620 is a wasteful number, since it uses less digits than its factorization.

13565620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1288 (or 1286 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 13565620 is about 3683.1535401066. The cubic root of 13565620 is about 238.4953316392.

The spelling of 13565620 in words is "thirteen million, five hundred sixty-five thousand, six hundred twenty".