20617170205201 has 4 divisors (see below), whose sum is σ = 21829944923172. Its totient is φ = 19404395487232.

The previous prime is 20617170205169. The next prime is 20617170205231. The reversal of 20617170205201 is 10250207171602.

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 15195495459600 + 5421674745601 = 3898140^2 + 2328449^2 .

It is a cyclic number.

It is not a de Polignac number, because 20617170205201 - 2⁵ = 20617170205169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20617170205231) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 606387358960 + ... + 606387358993.

It is an arithmetic number, because the mean of its divisors is an integer number (5457486230793).

Almost surely, 2^{20617170205201} is an apocalyptic number.

It is an amenable number.

20617170205201 is a deficient number, since it is larger than the sum of its proper divisors (1212774717971).

20617170205201 is a wasteful number, since it uses less digits than its factorization.

20617170205201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1212774717970.

The product of its (nonzero) digits is 11760, while the sum is 34.

Adding to 20617170205201 its reverse (10250207171602), we get a palindrome (30867377376803).

The spelling of 20617170205201 in words is "twenty trillion, six hundred seventeen billion, one hundred seventy million, two hundred five thousand, two hundred one".