20011171 has 2 divisors, whose sum is σ = 20011172. Its totient is φ = 20011170.

The previous prime is 20011163. The next prime is 20011177. The reversal of 20011171 is 17111002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20011171 - 2³ = 20011163 is a prime.

It is not a weakly prime, because it can be changed into another prime (20011177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10005585 + 10005586.

It is an arithmetic number, because the mean of its divisors is an integer number (10005586).

Almost surely, 2^20011171 is an apocalyptic number.

20011171 is a deficient number, since it is larger than the sum of its proper divisors (1).

20011171 is an equidigital number, since it uses as much as digits as its factorization.

20011171 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14, while the sum is 13.

The square root of 20011171 is about 4473.3847364160. The cubic root of 20011171 is about 271.4922901851.

Adding to 20011171 its reverse (17111002), we get a palindrome (37122173).

The spelling of 20011171 in words is "twenty million, eleven thousand, one hundred seventy-one".