20008817 has 2 divisors, whose sum is σ = 20008818. Its totient is φ = 20008816.

The previous prime is 20008801. The next prime is 20008829. The reversal of 20008817 is 71880002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19855936 + 152881 = 4456^2 + 391^2 .

It is a cyclic number.

It is not a de Polignac number, because 20008817 - 2⁴ = 20008801 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20008217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10004408 + 10004409.

It is an arithmetic number, because the mean of its divisors is an integer number (10004409).

Almost surely, 2^20008817 is an apocalyptic number.

It is an amenable number.

20008817 is a deficient number, since it is larger than the sum of its proper divisors (1).

20008817 is an equidigital number, since it uses as much as digits as its factorization.

20008817 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 896, while the sum is 26.

The square root of 20008817 is about 4473.1216169472. The cubic root of 20008817 is about 271.4816441662.

Adding to 20008817 its reverse (71880002), we get a palindrome (91888819).

The spelling of 20008817 in words is "twenty million, eight thousand, eight hundred seventeen".