20717086165 has 16 divisors (see below), whose sum is σ = 25114991616. Its totient is φ = 16404120000.

The previous prime is 20717086157. The next prime is 20717086211. The reversal of 20717086165 is 56168071702.

It is not a de Polignac number, because 20717086165 - 2³ = 20717086157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2259340 + ... + 2268490.

It is an arithmetic number, because the mean of its divisors is an integer number (1569686976).

Almost surely, 2^20717086165 is an apocalyptic number.

It is an amenable number.

20717086165 is a deficient number, since it is larger than the sum of its proper divisors (4397905451).

20717086165 is a wasteful number, since it uses less digits than its factorization.

20717086165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13740.

The product of its (nonzero) digits is 141120, while the sum is 43.

The spelling of 20717086165 in words is "twenty billion, seven hundred seventeen million, eighty-six thousand, one hundred sixty-five".