20318117 has 2 divisors, whose sum is σ = 20318118. Its totient is φ = 20318116.

The previous prime is 20318101. The next prime is 20318119. The reversal of 20318117 is 71181302.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11826721 + 8491396 = 3439^2 + 2914^2 .

It is a cyclic number.

It is not a de Polignac number, because 20318117 - 2⁴ = 20318101 is a prime.

Together with 20318119, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 20318092 and 20318101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20318119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10159058 + 10159059.

It is an arithmetic number, because the mean of its divisors is an integer number (10159059).

Almost surely, 2^20318117 is an apocalyptic number.

It is an amenable number.

20318117 is a deficient number, since it is larger than the sum of its proper divisors (1).

20318117 is an equidigital number, since it uses as much as digits as its factorization.

20318117 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 336, while the sum is 23.

The square root of 20318117 is about 4507.5622014566. The cubic root of 20318117 is about 272.8733686169.

Adding to 20318117 its reverse (71181302), we get a palindrome (91499419).

The spelling of 20318117 in words is "twenty million, three hundred eighteen thousand, one hundred seventeen".