20018171 has 2 divisors, whose sum is σ = 20018172. Its totient is φ = 20018170.

The previous prime is 20018161. The next prime is 20018227. The reversal of 20018171 is 17181002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20018171 - 2¹⁰ = 20017147 is a prime.

It is not a weakly prime, because it can be changed into another prime (20018101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10009085 + 10009086.

It is an arithmetic number, because the mean of its divisors is an integer number (10009086).

Almost surely, 2^20018171 is an apocalyptic number.

20018171 is a deficient number, since it is larger than the sum of its proper divisors (1).

20018171 is an equidigital number, since it uses as much as digits as its factorization.

20018171 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112, while the sum is 20.

The square root of 20018171 is about 4474.1670733221. The cubic root of 20018171 is about 271.5239429134.

Adding to 20018171 its reverse (17181002), we get a palindrome (37199173).

The spelling of 20018171 in words is "twenty million, eighteen thousand, one hundred seventy-one".