20310120644017 has 2 divisors, whose sum is σ = 20310120644018. Its totient is φ = 20310120644016.

The previous prime is 20310120643999. The next prime is 20310120644113. The reversal of 20310120644017 is 71044602101302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19992335895841 + 317784748176 = 4471279^2 + 563724^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20310120644017 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20310120644017.

It is not a weakly prime, because it can be changed into another prime (20310120647017) 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, 10155060322008 + 10155060322009.

It is an arithmetic number, because the mean of its divisors is an integer number (10155060322009).

Almost surely, 2^{20310120644017} is an apocalyptic number.

It is an amenable number.

20310120644017 is a deficient number, since it is larger than the sum of its proper divisors (1).

20310120644017 is an equidigital number, since it uses as much as digits as its factorization.

20310120644017 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 31.

Adding to 20310120644017 its reverse (71044602101302), we get a palindrome (91354722745319).

The spelling of 20310120644017 in words is "twenty trillion, three hundred ten billion, one hundred twenty million, six hundred forty-four thousand, seventeen".