20115171 has 12 divisors (see below), whose sum is σ = 29118960. Its totient is φ = 13380720.

The previous prime is 20115127. The next prime is 20115191. The reversal of 20115171 is 17151102.

It is a happy number.

It is not a de Polignac number, because 20115171 - 2⁹ = 20114659 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20115101) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2386 + ... + 6776.

It is an arithmetic number, because the mean of its divisors is an integer number (2426580).

Almost surely, 2^20115171 is an apocalyptic number.

20115171 is a deficient number, since it is larger than the sum of its proper divisors (9003789).

20115171 is a wasteful number, since it uses less digits than its factorization.

20115171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4906 (or 4903 counting only the distinct ones).

The product of its (nonzero) digits is 70, while the sum is 18.

The square root of 20115171 is about 4484.9939799291. The cubic root of 20115171 is about 271.9618016933.

Adding to 20115171 its reverse (17151102), we get a palindrome (37266273).

The spelling of 20115171 in words is "twenty million, one hundred fifteen thousand, one hundred seventy-one".