1320320220 has 48 divisors (see below), whose sum is σ = 3698472960. Its totient is φ = 351935296.

The previous prime is 1320320213. The next prime is 1320320233. The reversal of 1320320220 is 220230231.

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 1320320220.

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, 278389 + ... + 283091.

It is an arithmetic number, because the mean of its divisors is an integer number (77051520).

Almost surely, 2^1320320220 is an apocalyptic number.

1320320220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1320320220 is an abundant number, since it is smaller than the sum of its proper divisors (2378152740).

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

1320320220 is a wasteful number, since it uses less digits than its factorization.

1320320220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9394 (or 9392 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 1320320220 is about 36336.2108646458. The cubic root of 1320320220 is about 1097.0500075951.

Adding to 1320320220 its reverse (220230231), we get a palindrome (1540550451).

The spelling of 1320320220 in words is "one billion, three hundred twenty million, three hundred twenty thousand, two hundred twenty".