13220306 has 16 divisors (see below), whose sum is σ = 21958560. Its totient is φ = 5918880.

The previous prime is 13220287. The next prime is 13220309. The reversal of 13220306 is 60302231.

It is not an unprimeable number, because it can be changed into a prime (13220309) 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 7 ways as a sum of consecutive naturals, for example, 3011 + ... + 5958.

It is an arithmetic number, because the mean of its divisors is an integer number (1372410).

Almost surely, 2^13220306 is an apocalyptic number.

13220306 is a deficient number, since it is larger than the sum of its proper divisors (8738254).

13220306 is a wasteful number, since it uses less digits than its factorization.

13220306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9049.

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 13220306 is about 3635.9738722934. The cubic root of 13220306 is about 236.4542743924.

Adding to 13220306 its reverse (60302231), we get a palindrome (73522537).

The spelling of 13220306 in words is "thirteen million, two hundred twenty thousand, three hundred six".