20171271 has 4 divisors (see below), whose sum is σ = 26895032. Its totient is φ = 13447512.

The previous prime is 20171233. The next prime is 20171279. The reversal of 20171271 is 17217102.

It is a happy number.

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

It is not a de Polignac number, because 20171271 - 2¹⁰ = 20170247 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20171279) 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, 3361876 + ... + 3361881.

It is an arithmetic number, because the mean of its divisors is an integer number (6723758).

Almost surely, 2^20171271 is an apocalyptic number.

20171271 is a deficient number, since it is larger than the sum of its proper divisors (6723761).

20171271 is an equidigital number, since it uses as much as digits as its factorization.

20171271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6723760.

The product of its (nonzero) digits is 196, while the sum is 21.

The square root of 20171271 is about 4491.2438143570. The cubic root of 20171271 is about 272.2143953756.

Adding to 20171271 its reverse (17217102), we get a palindrome (37388373).

The spelling of 20171271 in words is "twenty million, one hundred seventy-one thousand, two hundred seventy-one".