20012171 has 2 divisors, whose sum is σ = 20012172. Its totient is φ = 20012170.

The previous prime is 20012119. The next prime is 20012189. The reversal of 20012171 is 17121002.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20012171 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20012101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10006085 + 10006086.

It is an arithmetic number, because the mean of its divisors is an integer number (10006086).

Almost surely, 2^20012171 is an apocalyptic number.

20012171 is a deficient number, since it is larger than the sum of its proper divisors (1).

20012171 is an equidigital number, since it uses as much as digits as its factorization.

20012171 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28, while the sum is 14.

The square root of 20012171 is about 4473.4965072078. The cubic root of 20012171 is about 271.4968124553.

Adding to 20012171 its reverse (17121002), we get a palindrome (37133173).

The spelling of 20012171 in words is "twenty million, twelve thousand, one hundred seventy-one".