20517028018163 has 16 divisors (see below), whose sum is σ = 20811217330176. Its totient is φ = 20223198123840.

The previous prime is 20517028018147. The next prime is 20517028018273. The reversal of 20517028018163 is 36181082071502.

It is a cyclic number.

It is not a de Polignac number, because 20517028018163 - 2⁴ = 20517028018147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20517028018103) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 858046178 + ... + 858070088.

It is an arithmetic number, because the mean of its divisors is an integer number (1300701083136).

Almost surely, 2^{20517028018163} is an apocalyptic number.

20517028018163 is a deficient number, since it is larger than the sum of its proper divisors (294189312013).

20517028018163 is a wasteful number, since it uses less digits than its factorization.

20517028018163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30914.

The product of its (nonzero) digits is 161280, while the sum is 44.

The spelling of 20517028018163 in words is "twenty trillion, five hundred seventeen billion, twenty-eight million, eighteen thousand, one hundred sixty-three".