20201863007857 has 2 divisors, whose sum is σ = 20201863007858. Its totient is φ = 20201863007856.

The previous prime is 20201863007849. The next prime is 20201863007873. The reversal of 20201863007857 is 75870036810202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20074127533056 + 127735474801 = 4480416^2 + 357401^2 .

It is a cyclic number.

It is not a de Polignac number, because 20201863007857 - 2³ = 20201863007849 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20201863007857.

It is not a weakly prime, because it can be changed into another prime (20201863007257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10100931503928 + 10100931503929.

It is an arithmetic number, because the mean of its divisors is an integer number (10100931503929).

Almost surely, 2^{20201863007857} is an apocalyptic number.

It is an amenable number.

20201863007857 is a deficient number, since it is larger than the sum of its proper divisors (1).

20201863007857 is an equidigital number, since it uses as much as digits as its factorization.

20201863007857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1128960, while the sum is 49.

The spelling of 20201863007857 in words is "twenty trillion, two hundred one billion, eight hundred sixty-three million, seven thousand, eight hundred fifty-seven".