20017271 has 4 divisors (see below), whose sum is σ = 20026632. Its totient is φ = 20007912.

The previous prime is 20017247. The next prime is 20017301. The reversal of 20017271 is 17271002.

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 20017271 - 2²² = 15822967 is a prime.

It is a super-2 number, since 2×20017271² = 801382276574882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20017171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 281 + ... + 6333.

It is an arithmetic number, because the mean of its divisors is an integer number (5006658).

Almost surely, 2^20017271 is an apocalyptic number.

20017271 is a deficient number, since it is larger than the sum of its proper divisors (9361).

20017271 is an equidigital number, since it uses as much as digits as its factorization.

20017271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9360.

The product of its (nonzero) digits is 196, while the sum is 20.

The square root of 20017271 is about 4474.0664948121. The cubic root of 20017271 is about 271.5198736903.

Adding to 20017271 its reverse (17271002), we get a palindrome (37288273).

It can be divided in two parts, 200 and 17271, that added together give a palindrome (17471).

The spelling of 20017271 in words is "twenty million, seventeen thousand, two hundred seventy-one".