20646271 has 2 divisors, whose sum is σ = 20646272. Its totient is φ = 20646270.

The previous prime is 20646257. The next prime is 20646277. The reversal of 20646271 is 17264602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20646271 - 2¹¹ = 20644223 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20646277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10323135 + 10323136.

It is an arithmetic number, because the mean of its divisors is an integer number (10323136).

Almost surely, 2^20646271 is an apocalyptic number.

20646271 is a deficient number, since it is larger than the sum of its proper divisors (1).

20646271 is an equidigital number, since it uses as much as digits as its factorization.

20646271 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 20646271 is about 4543.8167876797. The cubic root of 20646271 is about 274.3345718527.

The spelling of 20646271 in words is "twenty million, six hundred forty-six thousand, two hundred seventy-one".