20071171 has 4 divisors (see below), whose sum is σ = 20110072. Its totient is φ = 20032272.

The previous prime is 20071159. The next prime is 20071187. The reversal of 20071171 is 17117002.

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

It is a cyclic number.

It is not a de Polignac number, because 20071171 - 2¹¹ = 20069123 is a prime.

It is a super-2 number, since 2×20071171² = 805703810622482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20071141) 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, 18666 + ... + 19711.

It is an arithmetic number, because the mean of its divisors is an integer number (5027518).

Almost surely, 2^20071171 is an apocalyptic number.

20071171 is a deficient number, since it is larger than the sum of its proper divisors (38901).

20071171 is an equidigital number, since it uses as much as digits as its factorization.

20071171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38900.

The product of its (nonzero) digits is 98, while the sum is 19.

The square root of 20071171 is about 4480.0860482808. The cubic root of 20071171 is about 271.7633601795.

Adding to 20071171 its reverse (17117002), we get a palindrome (37188173).

The spelling of 20071171 in words is "twenty million, seventy-one thousand, one hundred seventy-one".