20330309 has 2 divisors, whose sum is σ = 20330310. Its totient is φ = 20330308.

The previous prime is 20330291. The next prime is 20330333. The reversal of 20330309 is 90303302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13853284 + 6477025 = 3722^2 + 2545^2 .

It is a cyclic number.

It is not a de Polignac number, because 20330309 - 2¹² = 20326213 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20330339) 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 as a sum of consecutive naturals, namely, 10165154 + 10165155.

It is an arithmetic number, because the mean of its divisors is an integer number (10165155).

Almost surely, 2^20330309 is an apocalyptic number.

It is an amenable number.

20330309 is a deficient number, since it is larger than the sum of its proper divisors (1).

20330309 is an equidigital number, since it uses as much as digits as its factorization.

20330309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 486, while the sum is 20.

The square root of 20330309 is about 4508.9143926227. The cubic root of 20330309 is about 272.9279374351.

The spelling of 20330309 in words is "twenty million, three hundred thirty thousand, three hundred nine".