20310309 has 12 divisors (see below), whose sum is σ = 29380416. Its totient is φ = 13520232.

The previous prime is 20310287. The next prime is 20310317. The reversal of 20310309 is 90301302.

It is not a de Polignac number, because 20310309 - 2⁷ = 20310181 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20310291 and 20310300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20310379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7332 + ... + 9714.

It is an arithmetic number, because the mean of its divisors is an integer number (2448368).

Almost surely, 2^20310309 is an apocalyptic number.

It is an amenable number.

20310309 is a deficient number, since it is larger than the sum of its proper divisors (9070107).

20310309 is a wasteful number, since it uses less digits than its factorization.

20310309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3336 (or 3333 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 18.

The square root of 20310309 is about 4506.6960181490. The cubic root of 20310309 is about 272.8384101897.

The spelling of 20310309 in words is "twenty million, three hundred ten thousand, three hundred nine".