13220744 has 16 divisors (see below), whose sum is σ = 25257420. Its totient is φ = 6485440.

The previous prime is 13220741. The next prime is 13220749. The reversal of 13220744 is 44702231.

13220744 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 12687844 + 532900 = 3562^2 + 730^2 .

It is not an unprimeable number, because it can be changed into a prime (13220741) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15167 + ... + 16014.

Almost surely, 2^13220744 is an apocalyptic number.

It is an amenable number.

13220744 is a deficient number, since it is larger than the sum of its proper divisors (12036676).

13220744 is a wasteful number, since it uses less digits than its factorization.

13220744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31240 (or 31236 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 23.

The square root of 13220744 is about 3636.0341032504. The cubic root of 13220744 is about 236.4568856741.

Adding to 13220744 its reverse (44702231), we get a palindrome (57922975).

The spelling of 13220744 in words is "thirteen million, two hundred twenty thousand, seven hundred forty-four".