309509468020 has 12 divisors (see below), whose sum is σ = 649969882884. Its totient is φ = 123803787200.

The previous prime is 309509468017. The next prime is 309509468027. The reversal of 309509468020 is 20864905903.

It can be written as a sum of positive squares in 2 ways, for example, as 119800438884 + 189709029136 = 346122^2 + 435556^2 .

It is a super-2 number, since 2×309509468020² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (309509468027) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 7737736681 + ... + 7737736720.

It is an arithmetic number, because the mean of its divisors is an integer number (54164156907).

Almost surely, 2^309509468020 is an apocalyptic number.

It is an amenable number.

309509468020 is an abundant number, since it is smaller than the sum of its proper divisors (340460414864).

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

309509468020 is a wasteful number, since it uses less digits than its factorization.

309509468020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15475473410 (or 15475473408 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 46.

The spelling of 309509468020 in words is "three hundred nine billion, five hundred nine million, four hundred sixty-eight thousand, twenty".