13220307 has 32 divisors (see below), whose sum is σ = 20486400. Its totient is φ = 8418816.

The previous prime is 13220287. The next prime is 13220309. The reversal of 13220307 is 70302231.

It is not a de Polignac number, because 13220307 - 2⁶ = 13220243 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13220307.

It is not an unprimeable number, because it can be changed into a prime (13220309) 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, 68403 + ... + 68595.

It is an arithmetic number, because the mean of its divisors is an integer number (640200).

Almost surely, 2^13220307 is an apocalyptic number.

13220307 is a deficient number, since it is larger than the sum of its proper divisors (7266093).

13220307 is a wasteful number, since it uses less digits than its factorization.

13220307 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304 (or 298 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 18.

The square root of 13220307 is about 3635.9740098081. The cubic root of 13220307 is about 236.4542803543.

Adding to 13220307 its reverse (70302231), we get a palindrome (83522538).

The spelling of 13220307 in words is "thirteen million, two hundred twenty thousand, three hundred seven".