13331220 has 48 divisors (see below), whose sum is σ = 42661248. Its totient is φ = 3047040.

The previous prime is 13331203. The next prime is 13331231. The reversal of 13331220 is 2213331.

13331220 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 13331220.

It is a congruent number.

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, 15451 + ... + 16290.

It is an arithmetic number, because the mean of its divisors is an integer number (888776).

Almost surely, 2^13331220 is an apocalyptic number.

13331220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13331220 is an abundant number, since it is smaller than the sum of its proper divisors (29330028).

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

13331220 is a wasteful number, since it uses less digits than its factorization.

13331220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31760 (or 31758 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 15.

The square root of 13331220 is about 3651.1943251490. The cubic root of 13331220 is about 237.1136914687.

Adding to 13331220 its reverse (2213331), we get a palindrome (15544551).

The spelling of 13331220 in words is "thirteen million, three hundred thirty-one thousand, two hundred twenty".