20495317 has 2 divisors, whose sum is σ = 20495318. Its totient is φ = 20495316.

The previous prime is 20495303. The next prime is 20495333. The reversal of 20495317 is 71359402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14546596 + 5948721 = 3814^2 + 2439^2 .

It is a cyclic number.

It is not a de Polignac number, because 20495317 - 2¹⁵ = 20462549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20495347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10247658 + 10247659.

It is an arithmetic number, because the mean of its divisors is an integer number (10247659).

Almost surely, 2^20495317 is an apocalyptic number.

It is an amenable number.

20495317 is a deficient number, since it is larger than the sum of its proper divisors (1).

20495317 is an equidigital number, since it uses as much as digits as its factorization.

20495317 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 20495317 is about 4527.1753886944. The cubic root of 20495317 is about 273.6643420274.

The spelling of 20495317 in words is "twenty million, four hundred ninety-five thousand, three hundred seventeen".