20448317 has 2 divisors, whose sum is σ = 20448318. Its totient is φ = 20448316.

The previous prime is 20448293. The next prime is 20448319. The reversal of 20448317 is 71384402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18156121 + 2292196 = 4261^2 + 1514^2 .

It is a cyclic number.

It is not a de Polignac number, because 20448317 - 2⁸ = 20448061 is a prime.

Together with 20448319, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_1297172 and since 20448317 and 1297172 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20448317.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20448319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10224158 + 10224159.

It is an arithmetic number, because the mean of its divisors is an integer number (10224159).

Almost surely, 2^20448317 is an apocalyptic number.

It is an amenable number.

20448317 is a deficient number, since it is larger than the sum of its proper divisors (1).

20448317 is an equidigital number, since it uses as much as digits as its factorization.

20448317 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 20448317 is about 4521.9815346814. The cubic root of 20448317 is about 273.4549922763.

The spelling of 20448317 in words is "twenty million, four hundred forty-eight thousand, three hundred seventeen".