20157171 has 8 divisors (see below), whose sum is σ = 26903184. Its totient is φ = 13424640.

The previous prime is 20157169. The next prime is 20157187. The reversal of 20157171 is 17175102.

It is a happy number.

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

It is not a de Polignac number, because 20157171 - 2¹ = 20157169 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20167171) 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, 891 + ... + 6411.

It is an arithmetic number, because the mean of its divisors is an integer number (3362898).

Almost surely, 2^20157171 is an apocalyptic number.

20157171 is a deficient number, since it is larger than the sum of its proper divisors (6746013).

20157171 is a wasteful number, since it uses less digits than its factorization.

20157171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6741.

The product of its (nonzero) digits is 490, while the sum is 24.

The square root of 20157171 is about 4489.6738188871. The cubic root of 20157171 is about 272.1509533702.

The spelling of 20157171 in words is "twenty million, one hundred fifty-seven thousand, one hundred seventy-one".