13220516 has 12 divisors (see below), whose sum is σ = 23195340. Its totient is φ = 6593280.

The previous prime is 13220461. The next prime is 13220521. The reversal of 13220516 is 61502231.

13220516 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 8726116 + 4494400 = 2954^2 + 2120^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2405 + ... + 5676.

It is an arithmetic number, because the mean of its divisors is an integer number (1932945).

Almost surely, 2^13220516 is an apocalyptic number.

It is an amenable number.

13220516 is a deficient number, since it is larger than the sum of its proper divisors (9974824).

13220516 is a wasteful number, since it uses less digits than its factorization.

13220516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8494 (or 8492 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 13220516 is about 3636.0027502740. The cubic root of 13220516 is about 236.4555263840.

Subtracting from 13220516 its sum of digits (20), we obtain a square (13220496 = 3636²).

Adding to 13220516 its reverse (61502231), we get a palindrome (74722747).

The spelling of 13220516 in words is "thirteen million, two hundred twenty thousand, five hundred sixteen".