1320820880 has 20 divisors (see below), whose sum is σ = 3070908732. Its totient is φ = 528328320.

The previous prime is 1320820877. The next prime is 1320820927. The reversal of 1320820880 is 880280231.

It can be written as a sum of positive squares in 2 ways, for example, as 909866896 + 410953984 = 30164^2 + 20272^2 .

It is a tau number, because it is divible by the number of its divisors (20).

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, 8255051 + ... + 8255210.

Almost surely, 2^1320820880 is an apocalyptic number.

1320820880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1320820880 is an abundant number, since it is smaller than the sum of its proper divisors (1750087852).

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

1320820880 is a wasteful number, since it uses less digits than its factorization.

1320820880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16510274 (or 16510268 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 32.

The square root of 1320820880 is about 36343.0994825703. The cubic root of 1320820880 is about 1097.1886556894.

The spelling of 1320820880 in words is "one billion, three hundred twenty million, eight hundred twenty thousand, eight hundred eighty".