13001220 has 36 divisors (see below), whose sum is σ = 39437580. Its totient is φ = 3466944.

The previous prime is 13001213. The next prime is 13001237. The reversal of 13001220 is 2210031.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 3154176 + 9847044 = 1776^2 + 3138^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (9).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35935 + ... + 36294.

Almost surely, 2^13001220 is an apocalyptic number.

13001220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13001220 is an abundant number, since it is smaller than the sum of its proper divisors (26436360).

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

13001220 is a wasteful number, since it uses less digits than its factorization.

13001220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72244 (or 72239 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 13001220 is about 3605.7204550547. The cubic root of 13001220 is about 235.1408239992.

Adding to 13001220 its reverse (2210031), we get a palindrome (15211251).

The spelling of 13001220 in words is "thirteen million, one thousand, two hundred twenty".