20890271 has 4 divisors (see below), whose sum is σ = 20968200. Its totient is φ = 20812344.

The previous prime is 20890241. The next prime is 20890277. The reversal of 20890271 is 17209802.

It is a happy number.

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 20890271 - 2¹⁴ = 20873887 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20890277) 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, 38561 + ... + 39098.

It is an arithmetic number, because the mean of its divisors is an integer number (5242050).

Almost surely, 2^20890271 is an apocalyptic number.

20890271 is a deficient number, since it is larger than the sum of its proper divisors (77929).

20890271 is an equidigital number, since it uses as much as digits as its factorization.

20890271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77928.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 20890271 is about 4570.5875989855. The cubic root of 20890271 is about 275.4110481018.

The spelling of 20890271 in words is "twenty million, eight hundred ninety thousand, two hundred seventy-one".