20814317 has 2 divisors, whose sum is σ = 20814318. Its totient is φ = 20814316.

The previous prime is 20814281. The next prime is 20814337. The reversal of 20814317 is 71341802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16273156 + 4541161 = 4034^2 + 2131^2 .

It is a cyclic number.

It is not a de Polignac number, because 20814317 - 2⁸ = 20814061 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 (20814337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10407158 + 10407159.

It is an arithmetic number, because the mean of its divisors is an integer number (10407159).

Almost surely, 2^20814317 is an apocalyptic number.

It is an amenable number.

20814317 is a deficient number, since it is larger than the sum of its proper divisors (1).

20814317 is an equidigital number, since it uses as much as digits as its factorization.

20814317 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 20814317 is about 4562.2710353507. The cubic root of 20814317 is about 275.0768578564.

The spelling of 20814317 in words is "twenty million, eight hundred fourteen thousand, three hundred seventeen".