13020013220 has 12 divisors (see below), whose sum is σ = 27342027804. Its totient is φ = 5208005280.

The previous prime is 13020013183. The next prime is 13020013243. The reversal of 13020013220 is 2231002031.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 7895744164 + 5124269056 = 88858^2 + 71584^2 .

It is a junction number, because it is equal to n+sod(n) for n = 13020013195 and 13020013204.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 325500311 + ... + 325500350.

It is an arithmetic number, because the mean of its divisors is an integer number (2278502317).

Almost surely, 2^13020013220 is an apocalyptic number.

13020013220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13020013220 is an abundant number, since it is smaller than the sum of its proper divisors (14322014584).

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

13020013220 is a wasteful number, since it uses less digits than its factorization.

13020013220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 651000670 (or 651000668 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

Adding to 13020013220 its reverse (2231002031), we get a palindrome (15251015251).

The spelling of 13020013220 in words is "thirteen billion, twenty million, thirteen thousand, two hundred twenty".