1320131220 has 24 divisors (see below), whose sum is σ = 3696367584. Its totient is φ = 352034976.

The previous prime is 1320131173. The next prime is 1320131221. The reversal of 1320131220 is 221310231.

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 1320131220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320131221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11001034 + ... + 11001153.

It is an arithmetic number, because the mean of its divisors is an integer number (154015316).

Almost surely, 2^1320131220 is an apocalyptic number.

1320131220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1320131220 is an abundant number, since it is smaller than the sum of its proper divisors (2376236364).

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

1320131220 is a wasteful number, since it uses less digits than its factorization.

1320131220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22002199 (or 22002197 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 1320131220 is about 36333.6100601083. The cubic root of 1320131220 is about 1096.9976585910.

Adding to 1320131220 its reverse (221310231), we get a palindrome (1541441451).

The spelling of 1320131220 in words is "one billion, three hundred twenty million, one hundred thirty-one thousand, two hundred twenty".