20500605017 has 4 divisors (see below), whose sum is σ = 20505957300. Its totient is φ = 20495252736.

The previous prime is 20500604983. The next prime is 20500605043. The reversal of 20500605017 is 71050600502.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1913100121 + 18587504896 = 43739^2 + 136336^2 .

It is a cyclic number.

It is not a de Polignac number, because 20500605017 - 2¹⁰ = 20500603993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20500605067) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2670392 + ... + 2678057.

It is an arithmetic number, because the mean of its divisors is an integer number (5126489325).

Almost surely, 2^20500605017 is an apocalyptic number.

It is an amenable number.

20500605017 is a deficient number, since it is larger than the sum of its proper divisors (5352283).

20500605017 is an equidigital number, since it uses as much as digits as its factorization.

20500605017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5352282.

The product of its (nonzero) digits is 2100, while the sum is 26.

The spelling of 20500605017 in words is "twenty billion, five hundred million, six hundred five thousand, seventeen".