20201020212017 has 2 divisors, whose sum is σ = 20201020212018. Its totient is φ = 20201020212016.

The previous prime is 20201020211987. The next prime is 20201020212019. The reversal of 20201020212017 is 71021202010202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19842890975296 + 358129236721 = 4454536^2 + 598439^2 .

It is a cyclic number.

It is not a de Polignac number, because 20201020212017 - 2³⁸ = 19926142305073 is a prime.

Together with 20201020212019, it forms a pair of twin primes.

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 20201020212017.

It is not a weakly prime, because it can be changed into another prime (20201020212019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10100510106008 + 10100510106009.

It is an arithmetic number, because the mean of its divisors is an integer number (10100510106009).

Almost surely, 2^{20201020212017} is an apocalyptic number.

It is an amenable number.

20201020212017 is a deficient number, since it is larger than the sum of its proper divisors (1).

20201020212017 is an equidigital number, since it uses as much as digits as its factorization.

20201020212017 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 224, while the sum is 20.

Adding to 20201020212017 its reverse (71021202010202), we get a palindrome (91222222222219).

The spelling of 20201020212017 in words is "twenty trillion, two hundred one billion, twenty million, two hundred twelve thousand, seventeen".