20201171 has 4 divisors (see below), whose sum is σ = 20211432. Its totient is φ = 20190912.

The previous prime is 20201143. The next prime is 20201173. The reversal of 20201171 is 17110202.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20201171 - 2¹⁸ = 19939027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20201173) 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, 1145 + ... + 6458.

It is an arithmetic number, because the mean of its divisors is an integer number (5052858).

Almost surely, 2^20201171 is an apocalyptic number.

20201171 is a deficient number, since it is larger than the sum of its proper divisors (10261).

20201171 is an equidigital number, since it uses as much as digits as its factorization.

20201171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10260.

The product of its (nonzero) digits is 28, while the sum is 14.

The square root of 20201171 is about 4494.5712810011. The cubic root of 20201171 is about 272.3488306677.

Adding to 20201171 its reverse (17110202), we get a palindrome (37311373).

The spelling of 20201171 in words is "twenty million, two hundred one thousand, one hundred seventy-one".