309930020 has 24 divisors (see below), whose sum is σ = 661525368. Its totient is φ = 121939200.

The previous prime is 309930017. The next prime is 309930073. The reversal of 309930020 is 20039903.

309930020 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 47554816 + 262375204 = 6896^2 + 16198^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 125801 + ... + 128240.

It is an arithmetic number, because the mean of its divisors is an integer number (27563557).

Almost surely, 2^309930020 is an apocalyptic number.

It is an amenable number.

309930020 is an abundant number, since it is smaller than the sum of its proper divisors (351595348).

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

309930020 is a wasteful number, since it uses less digits than its factorization.

309930020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254111 (or 254109 counting only the distinct ones).

The product of its (nonzero) digits is 1458, while the sum is 26.

The square root of 309930020 is about 17604.8294510342. The cubic root of 309930020 is about 676.7390147541.

Adding to 309930020 its reverse (20039903), we get a palindrome (329969923).

The spelling of 309930020 in words is "three hundred nine million, nine hundred thirty thousand, twenty".