13445220 has 48 divisors (see below), whose sum is σ = 37816128. Its totient is φ = 3569280.

The previous prime is 13445219. The next prime is 13445231. The reversal of 13445220 is 2254431.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19522 + ... + 20198.

It is an arithmetic number, because the mean of its divisors is an integer number (787836).

Almost surely, 2^13445220 is an apocalyptic number.

13445220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13445220 is an abundant number, since it is smaller than the sum of its proper divisors (24370908).

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

13445220 is a wasteful number, since it uses less digits than its factorization.

13445220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1020 (or 1018 counting only the distinct ones).

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

The square root of 13445220 is about 3666.7724227173. The cubic root of 13445220 is about 237.7876551507.

Adding to 13445220 its reverse (2254431), we get a palindrome (15699651).

It can be divided in two parts, 134 and 45220, that added together give a palindrome (45354).

The spelling of 13445220 in words is "thirteen million, four hundred forty-five thousand, two hundred twenty".