20320321309 has 2 divisors, whose sum is σ = 20320321310. Its totient is φ = 20320321308.

The previous prime is 20320321297. The next prime is 20320321331. The reversal of 20320321309 is 90312302302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14352758809 + 5967562500 = 119803^2 + 77250^2 .

It is a cyclic number.

It is not a de Polignac number, because 20320321309 - 2⁷ = 20320321181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20320321349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10160160654 + 10160160655.

It is an arithmetic number, because the mean of its divisors is an integer number (10160160655).

Almost surely, 2^20320321309 is an apocalyptic number.

It is an amenable number.

20320321309 is a deficient number, since it is larger than the sum of its proper divisors (1).

20320321309 is an equidigital number, since it uses as much as digits as its factorization.

20320321309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 25.

The spelling of 20320321309 in words is "twenty billion, three hundred twenty million, three hundred twenty-one thousand, three hundred nine".