13220445 has 24 divisors (see below), whose sum is σ = 24607584. Its totient is φ = 6043296.

The previous prime is 13220437. The next prime is 13220461. The reversal of 13220445 is 54402231.

It is not a de Polignac number, because 13220445 - 2³ = 13220437 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8259 + ... + 9728.

It is an arithmetic number, because the mean of its divisors is an integer number (1025316).

Almost surely, 2^13220445 is an apocalyptic number.

13220445 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13220445 is a deficient number, since it is larger than the sum of its proper divisors (11387139).

13220445 is a wasteful number, since it uses less digits than its factorization.

13220445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18009 (or 18002 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 13220445 is about 3635.9929867919. The cubic root of 13220445 is about 236.4551030930.

Adding to 13220445 its reverse (54402231), we get a palindrome (67622676).

The spelling of 13220445 in words is "thirteen million, two hundred twenty thousand, four hundred forty-five".