20716417 has 2 divisors, whose sum is σ = 20716418. Its totient is φ = 20716416.

The previous prime is 20716391. The next prime is 20716429. The reversal of 20716417 is 71461702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12645136 + 8071281 = 3556^2 + 2841^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20716417 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20716117) 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, 10358208 + 10358209.

It is an arithmetic number, because the mean of its divisors is an integer number (10358209).

Almost surely, 2^20716417 is an apocalyptic number.

It is an amenable number.

20716417 is a deficient number, since it is larger than the sum of its proper divisors (1).

20716417 is an equidigital number, since it uses as much as digits as its factorization.

20716417 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2352, while the sum is 28.

The square root of 20716417 is about 4551.5290837256. The cubic root of 20716417 is about 274.6449058689.

The spelling of 20716417 in words is "twenty million, seven hundred sixteen thousand, four hundred seventeen".