20271 has 8 divisors (see below), whose sum is σ = 28080. Its totient is φ = 12992.

The previous prime is 20269. The next prime is 20287. The reversal of 20271 is 17202.

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

It is not a de Polignac number, because 20271 - 2¹ = 20269 is a prime.

20271 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20201) 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, 30 + ... + 203.

It is an arithmetic number, because the mean of its divisors is an integer number (3510).

20271 is a deficient number, since it is larger than the sum of its proper divisors (7809).

20271 is a wasteful number, since it uses less digits than its factorization.

20271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265.

The product of its (nonzero) digits is 28, while the sum is 12.

The square root of 20271 is about 142.3762620664. The cubic root of 20271 is about 27.2662277441.

Adding to 20271 its reverse (17202), we get a palindrome (37473).

The spelling of 20271 in words is "twenty thousand, two hundred seventy-one", and thus it is an iban number.