20218271 has 2 divisors, whose sum is σ = 20218272. Its totient is φ = 20218270.

The previous prime is 20218259. The next prime is 20218291. The reversal of 20218271 is 17281202.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20218271 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 (20218291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10109135 + 10109136.

It is an arithmetic number, because the mean of its divisors is an integer number (10109136).

Almost surely, 2^20218271 is an apocalyptic number.

20218271 is a deficient number, since it is larger than the sum of its proper divisors (1).

20218271 is an equidigital number, since it uses as much as digits as its factorization.

20218271 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 20218271 is about 4496.4731734994. The cubic root of 20218271 is about 272.4256554476.

Adding to 20218271 its reverse (17281202), we get a palindrome (37499473).

The spelling of 20218271 in words is "twenty million, two hundred eighteen thousand, two hundred seventy-one".