20005171 has 8 divisors (see below), whose sum is σ = 20700288. Its totient is φ = 19320000.

The previous prime is 20005163. The next prime is 20005177. The reversal of 20005171 is 17150002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20005171 - 2³ = 20005163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20005177) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1726 + ... + 6556.

It is an arithmetic number, because the mean of its divisors is an integer number (2587536).

Almost surely, 2^20005171 is an apocalyptic number.

20005171 is a deficient number, since it is larger than the sum of its proper divisors (695117).

20005171 is a wasteful number, since it uses less digits than its factorization.

20005171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4973.

The product of its (nonzero) digits is 70, while the sum is 16.

The square root of 20005171 is about 4472.7140530108. The cubic root of 20005171 is about 271.4651533995.

Adding to 20005171 its reverse (17150002), we get a palindrome (37155173).

The spelling of 20005171 in words is "twenty million, five thousand, one hundred seventy-one".