1320000020 has 24 divisors (see below), whose sum is σ = 2935059624. Its totient is φ = 496941056.

The previous prime is 1320000001. The next prime is 1320000041. The reversal of 1320000020 is 200000231.

It can be written as a sum of positive squares in 4 ways, for example, as 445969924 + 874030096 = 21118^2 + 29564^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1319999962 and 1320000007.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1940837 + ... + 1941516.

It is an arithmetic number, because the mean of its divisors is an integer number (122294151).

Almost surely, 2^1320000020 is an apocalyptic number.

1320000020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1320000020 is an abundant number, since it is smaller than the sum of its proper divisors (1615059604).

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

1320000020 is a wasteful number, since it uses less digits than its factorization.

1320000020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3882379 (or 3882377 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 8.

The square root of 1320000020 is about 36331.8045244108. The cubic root of 1320000020 is about 1096.9613160267.

Adding to 1320000020 its reverse (200000231), we get a palindrome (1520000251).

The spelling of 1320000020 in words is "one billion, three hundred twenty million, twenty", and thus it is an aban number.