13220565 has 32 divisors (see below), whose sum is σ = 21964800. Its totient is φ = 6785856.

The previous prime is 13220551. The next prime is 13220567. The reversal of 13220565 is 56502231.

It is not a de Polignac number, because 13220565 - 2⁵ = 13220533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13220567) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 66336 + ... + 66534.

It is an arithmetic number, because the mean of its divisors is an integer number (686400).

Almost surely, 2^13220565 is an apocalyptic number.

13220565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13220565 is a deficient number, since it is larger than the sum of its proper divisors (8744235).

13220565 is a wasteful number, since it uses less digits than its factorization.

13220565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353.

The product of its (nonzero) digits is 1800, while the sum is 24.

The square root of 13220565 is about 3636.0094884365. The cubic root of 13220565 is about 236.4558185134.

Adding to 13220565 its reverse (56502231), we get a palindrome (69722796).

The spelling of 13220565 in words is "thirteen million, two hundred twenty thousand, five hundred sixty-five".