20914217 has 2 divisors, whose sum is σ = 20914218. Its totient is φ = 20914216.

The previous prime is 20914207. The next prime is 20914219. The reversal of 20914217 is 71241902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16736281 + 4177936 = 4091^2 + 2044^2 .

It is a cyclic number.

It is not a de Polignac number, because 20914217 - 2¹² = 20910121 is a prime.

Together with 20914219, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20914219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10457108 + 10457109.

It is an arithmetic number, because the mean of its divisors is an integer number (10457109).

Almost surely, 2^20914217 is an apocalyptic number.

It is an amenable number.

20914217 is a deficient number, since it is larger than the sum of its proper divisors (1).

20914217 is an equidigital number, since it uses as much as digits as its factorization.

20914217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 20914217 is about 4573.2064243810. The cubic root of 20914217 is about 275.5162402057.

The spelling of 20914217 in words is "twenty million, nine hundred fourteen thousand, two hundred seventeen".