1320320020 has 12 divisors (see below), whose sum is σ = 2772672084. Its totient is φ = 528128000.

The previous prime is 1320320017. The next prime is 1320320063. The reversal of 1320320020 is 200230231.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 339001744 + 981318276 = 18412^2 + 31326^2 .

It is a congruent number.

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, 33007981 + ... + 33008020.

It is an arithmetic number, because the mean of its divisors is an integer number (231056007).

Almost surely, 2^1320320020 is an apocalyptic number.

1320320020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1320320020 is an abundant number, since it is smaller than the sum of its proper divisors (1452352064).

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

1320320020 is a wasteful number, since it uses less digits than its factorization.

1320320020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66016010 (or 66016008 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 1320320020 is about 36336.2081125700. The cubic root of 1320320020 is about 1097.0499522019.

Adding to 1320320020 its reverse (200230231), we get a palindrome (1520550251).

The spelling of 1320320020 in words is "one billion, three hundred twenty million, three hundred twenty thousand, twenty".