20170355017 has 4 divisors (see below), whose sum is σ = 20235211776. Its totient is φ = 20105498260.

The previous prime is 20170354999. The next prime is 20170355069. The reversal of 20170355017 is 71055307102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20170355017 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20170355017.

It is not an unprimeable number, because it can be changed into a prime (20170350017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32427913 + ... + 32428534.

It is an arithmetic number, because the mean of its divisors is an integer number (5058802944).

Almost surely, 2^20170355017 is an apocalyptic number.

It is an amenable number.

20170355017 is a deficient number, since it is larger than the sum of its proper divisors (64856759).

20170355017 is an equidigital number, since it uses as much as digits as its factorization.

20170355017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64856758.

The product of its (nonzero) digits is 7350, while the sum is 31.

The spelling of 20170355017 in words is "twenty billion, one hundred seventy million, three hundred fifty-five thousand, seventeen".