320902090020 has 72 divisors (see below), whose sum is σ = 999711216504. Its totient is φ = 83261081088.

The previous prime is 320902090007. The next prime is 320902090039. The reversal of 320902090020 is 20090209023.

It can be written as a sum of positive squares in 4 ways, for example, as 60018140196 + 260883949824 = 244986^2 + 510768^2 .

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 23 ways as a sum of consecutive naturals, for example, 24085089 + ... + 24098408.

It is an arithmetic number, because the mean of its divisors is an integer number (13884878007).

Almost surely, 2^320902090020 is an apocalyptic number.

320902090020 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

320902090020 is an abundant number, since it is smaller than the sum of its proper divisors (678809126484).

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

320902090020 is a wasteful number, since it uses less digits than its factorization.

320902090020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48183549 (or 48183544 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

Adding to 320902090020 its reverse (20090209023), we get a palindrome (340992299043).

The spelling of 320902090020 in words is "three hundred twenty billion, nine hundred two million, ninety thousand, twenty".