309020 has 12 divisors (see below), whose sum is σ = 648984. Its totient is φ = 123600.

The previous prime is 309019. The next prime is 309031. The reversal of 309020 is 20903.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 308986 and 309004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7706 + ... + 7745.

It is an arithmetic number, because the mean of its divisors is an integer number (54082).

2³⁰⁹⁰²⁰ is an apocalyptic number.

It is an amenable number.

309020 is an abundant number, since it is smaller than the sum of its proper divisors (339964).

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

309020 is a wasteful number, since it uses less digits than its factorization.

309020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15460 (or 15458 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 14.

The square root of 309020 is about 555.8956736655. The cubic root of 309020 is about 67.6076015867.

Adding to 309020 its reverse (20903), we get a palindrome (329923).

The spelling of 309020 in words is "three hundred nine thousand, twenty".