20812271 has 2 divisors, whose sum is σ = 20812272. Its totient is φ = 20812270.

The previous prime is 20812247. The next prime is 20812279. The reversal of 20812271 is 17221802.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20812271 - 2²² = 16617967 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 (20812279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10406135 + 10406136.

It is an arithmetic number, because the mean of its divisors is an integer number (10406136).

Almost surely, 2^20812271 is an apocalyptic number.

20812271 is a deficient number, since it is larger than the sum of its proper divisors (1).

20812271 is an equidigital number, since it uses as much as digits as its factorization.

20812271 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 20812271 is about 4562.0467994092. The cubic root of 20812271 is about 275.0678444180.

The spelling of 20812271 in words is "twenty million, eight hundred twelve thousand, two hundred seventy-one".