13133220 has 24 divisors (see below), whose sum is σ = 36773184. Its totient is φ = 3502176.

The previous prime is 13133213. The next prime is 13133233. The reversal of 13133220 is 2233131.

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 13133220.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 109384 + ... + 109503.

It is an arithmetic number, because the mean of its divisors is an integer number (1532216).

Almost surely, 2^13133220 is an apocalyptic number.

13133220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13133220 is an abundant number, since it is smaller than the sum of its proper divisors (23639964).

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

13133220 is a wasteful number, since it uses less digits than its factorization.

13133220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218899 (or 218897 counting only the distinct ones).

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

The square root of 13133220 is about 3623.9784767573. The cubic root of 13133220 is about 235.9339324783.

Adding to 13133220 its reverse (2233131), we get a palindrome (15366351).

The spelling of 13133220 in words is "thirteen million, one hundred thirty-three thousand, two hundred twenty".