20710117 has 2 divisors, whose sum is σ = 20710118. Its totient is φ = 20710116.

The previous prime is 20710111. The next prime is 20710141. The reversal of 20710117 is 71101702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18653761 + 2056356 = 4319^2 + 1434^2 .

It is a cyclic number.

It is not a de Polignac number, because 20710117 - 2⁷ = 20709989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20710094 and 20710103.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20710111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10355058 + 10355059.

It is an arithmetic number, because the mean of its divisors is an integer number (10355059).

Almost surely, 2^20710117 is an apocalyptic number.

It is an amenable number.

20710117 is a deficient number, since it is larger than the sum of its proper divisors (1).

20710117 is an equidigital number, since it uses as much as digits as its factorization.

20710117 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 98, while the sum is 19.

The square root of 20710117 is about 4550.8369559895. The cubic root of 20710117 is about 274.6170625996.

Adding to 20710117 its reverse (71101702), we get a palindrome (91811819).

The spelling of 20710117 in words is "twenty million, seven hundred ten thousand, one hundred seventeen".