13220244 has 18 divisors (see below), whose sum is σ = 33417930. Its totient is φ = 4406736.

The previous prime is 13220243. The next prime is 13220261. The reversal of 13220244 is 44202231.

13220244 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 only one way, i.e., 6656400 + 6563844 = 2580^2 + 2562^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13220243) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 183579 + ... + 183650.

Almost surely, 2^13220244 is an apocalyptic number.

It is an amenable number.

13220244 is an abundant number, since it is smaller than the sum of its proper divisors (20197686).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13220244 is a wasteful number, since it uses less digits than its factorization.

13220244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367239 (or 367234 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 13220244 is about 3635.9653463695. The cubic root of 13220244 is about 236.4539047542.

Adding to 13220244 its reverse (44202231), we get a palindrome (57422475).

The spelling of 13220244 in words is "thirteen million, two hundred twenty thousand, two hundred forty-four".