20310709 has 2 divisors, whose sum is σ = 20310710. Its totient is φ = 20310708.

The previous prime is 20310683. The next prime is 20310737. The reversal of 20310709 is 90701302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13950225 + 6360484 = 3735^2 + 2522^2 .

It is a cyclic number.

It is not a de Polignac number, because 20310709 - 2⁹ = 20310197 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20310709.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20310769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10155354 + 10155355.

It is an arithmetic number, because the mean of its divisors is an integer number (10155355).

Almost surely, 2^20310709 is an apocalyptic number.

It is an amenable number.

20310709 is a deficient number, since it is larger than the sum of its proper divisors (1).

20310709 is an equidigital number, since it uses as much as digits as its factorization.

20310709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 378, while the sum is 22.

The square root of 20310709 is about 4506.7403963397. The cubic root of 20310709 is about 272.8402013105.

The spelling of 20310709 in words is "twenty million, three hundred ten thousand, seven hundred nine".