20201686685309 has 2 divisors, whose sum is σ = 20201686685310. Its totient is φ = 20201686685308.

The previous prime is 20201686685287. The next prime is 20201686685359. The reversal of 20201686685309 is 90358668610202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13596940884409 + 6604745800900 = 3687403^2 + 2569970^2 .

It is a cyclic number.

It is not a de Polignac number, because 20201686685309 - 2⁸ = 20201686685053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20201686685359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10100843342654 + 10100843342655.

It is an arithmetic number, because the mean of its divisors is an integer number (10100843342655).

Almost surely, 2^{20201686685309} is an apocalyptic number.

It is an amenable number.

20201686685309 is a deficient number, since it is larger than the sum of its proper divisors (1).

20201686685309 is an equidigital number, since it uses as much as digits as its factorization.

20201686685309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7464960, while the sum is 56.

The spelling of 20201686685309 in words is "twenty trillion, two hundred one billion, six hundred eighty-six million, six hundred eighty-five thousand, three hundred nine".