16820317 has 2 divisors, whose sum is σ = 16820318. Its totient is φ = 16820316.

The previous prime is 16820303. The next prime is 16820333. The reversal of 16820317 is 71302861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16818201 + 2116 = 4101^2 + 46^2 .

It is a cyclic number.

It is not a de Polignac number, because 16820317 - 2⁷ = 16820189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16820347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8410158 + 8410159.

It is an arithmetic number, because the mean of its divisors is an integer number (8410159).

Almost surely, 2^16820317 is an apocalyptic number.

It is an amenable number.

16820317 is a deficient number, since it is larger than the sum of its proper divisors (1).

16820317 is an equidigital number, since it uses as much as digits as its factorization.

16820317 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 16820317 is about 4101.2579777429. The cubic root of 16820317 is about 256.2190355605.

The spelling of 16820317 in words is "sixteen million, eight hundred twenty thousand, three hundred seventeen".