20017064257 has 2 divisors, whose sum is σ = 20017064258. Its totient is φ = 20017064256.

The previous prime is 20017064213. The next prime is 20017064297. The reversal of 20017064257 is 75246071002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15256202256 + 4760862001 = 123516^2 + 68999^2 .

It is a cyclic number.

It is not a de Polignac number, because 20017064257 - 2¹¹ = 20017062209 is a prime.

It is a super-2 number, since 2×20017064257² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20017064297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10008532128 + 10008532129.

It is an arithmetic number, because the mean of its divisors is an integer number (10008532129).

Almost surely, 2^20017064257 is an apocalyptic number.

It is an amenable number.

20017064257 is a deficient number, since it is larger than the sum of its proper divisors (1).

20017064257 is an equidigital number, since it uses as much as digits as its factorization.

20017064257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23520, while the sum is 34.

The spelling of 20017064257 in words is "twenty billion, seventeen million, sixty-four thousand, two hundred fifty-seven".