309806926920 has 96 divisors (see below), whose sum is σ = 1041592289400. Its totient is φ = 79766378496.

The previous prime is 309806926883. The next prime is 309806926937. The reversal of 309806926920 is 29629608903.

It can be written as a sum of positive squares in 4 ways, for example, as 308204846244 + 1602080676 = 555162^2 + 40026^2 .

It is a super-2 number, since 2×309806926920² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14827057 + ... + 14847936.

Almost surely, 2^309806926920 is an apocalyptic number.

309806926920 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

309806926920 is an abundant number, since it is smaller than the sum of its proper divisors (731785362480).

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

309806926920 is a wasteful number, since it uses less digits than its factorization.

309806926920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29675039 (or 29675032 counting only the distinct ones).

The product of its (nonzero) digits is 2519424, while the sum is 54.

The spelling of 309806926920 in words is "three hundred nine billion, eight hundred six million, nine hundred twenty-six thousand, nine hundred twenty".