13220564 has 12 divisors (see below), whose sum is σ = 26441184. Its totient is φ = 5665944.

The previous prime is 13220551. The next prime is 13220567. The reversal of 13220564 is 46502231.

13220564 is an admirable number.

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 pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 236054 + ... + 236109.

It is an arithmetic number, because the mean of its divisors is an integer number (2203432).

Almost surely, 2^13220564 is an apocalyptic number.

13220564 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

13220564 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

13220564 is a wasteful number, since it uses less digits than its factorization.

13220564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 472174 (or 472172 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 13220564 is about 3636.0093509231. The cubic root of 13220564 is about 236.4558125516.

Adding to 13220564 its reverse (46502231), we get a palindrome (59722795).

The spelling of 13220564 in words is "thirteen million, two hundred twenty thousand, five hundred sixty-four".