13220566 has 4 divisors (see below), whose sum is σ = 19830852. Its totient is φ = 6610282.

The previous prime is 13220551. The next prime is 13220567. The reversal of 13220566 is 66502231.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 13220566.

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 as a sum of consecutive naturals, namely, 3305140 + ... + 3305143.

It is an arithmetic number, because the mean of its divisors is an integer number (4957713).

Almost surely, 2^13220566 is an apocalyptic number.

13220566 is a deficient number, since it is larger than the sum of its proper divisors (6610286).

13220566 is an equidigital number, since it uses as much as digits as its factorization.

13220566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6610285.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 13220566 is about 3636.0096259499. The cubic root of 13220566 is about 236.4558244752.

Adding to 13220566 its reverse (66502231), we get a palindrome (79722797).

The spelling of 13220566 in words is "thirteen million, two hundred twenty thousand, five hundred sixty-six".