20320001320 has 64 divisors (see below), whose sum is σ = 46131670800. Its totient is φ = 8055091200.

The previous prime is 20320001311. The next prime is 20320001347. The reversal of 20320001320 is 2310002302.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 6129950436 + 14190050884 = 78294^2 + 119122^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20320001320.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 2514246 + ... + 2522314.

Almost surely, 2^20320001320 is an apocalyptic number.

20320001320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20320001320 is an abundant number, since it is smaller than the sum of its proper divisors (25811669480).

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

20320001320 is a wasteful number, since it uses less digits than its factorization.

20320001320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8638 (or 8634 counting only the distinct ones).

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

Adding to 20320001320 its reverse (2310002302), we get a palindrome (22630003622).

The spelling of 20320001320 in words is "twenty billion, three hundred twenty million, one thousand, three hundred twenty".