20867317 has 2 divisors, whose sum is σ = 20867318. Its totient is φ = 20867316.

The previous prime is 20867303. The next prime is 20867333. The reversal of 20867317 is 71376802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19766916 + 1100401 = 4446^2 + 1049^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20867317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20867117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10433658 + 10433659.

It is an arithmetic number, because the mean of its divisors is an integer number (10433659).

Almost surely, 2^20867317 is an apocalyptic number.

It is an amenable number.

20867317 is a deficient number, since it is larger than the sum of its proper divisors (1).

20867317 is an equidigital number, since it uses as much as digits as its factorization.

20867317 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14112, while the sum is 34.

The square root of 20867317 is about 4568.0758531355. The cubic root of 20867317 is about 275.3101382565.

The spelling of 20867317 in words is "twenty million, eight hundred sixty-seven thousand, three hundred seventeen".