20663017 has 2 divisors, whose sum is σ = 20663018. Its totient is φ = 20663016.

The previous prime is 20663009. The next prime is 20663047. The reversal of 20663017 is 71036602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16883881 + 3779136 = 4109^2 + 1944^2 .

It is a cyclic number.

It is not a de Polignac number, because 20663017 - 2³ = 20663009 is a prime.

It is equal to p_1309930 and since 20663017 and 1309930 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 20662982 and 20663000.

It is not a weakly prime, because it can be changed into another prime (20663047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10331508 + 10331509.

It is an arithmetic number, because the mean of its divisors is an integer number (10331509).

Almost surely, 2^20663017 is an apocalyptic number.

It is an amenable number.

20663017 is a deficient number, since it is larger than the sum of its proper divisors (1).

20663017 is an equidigital number, since it uses as much as digits as its factorization.

20663017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1512, while the sum is 25.

The square root of 20663017 is about 4545.6591381229. The cubic root of 20663017 is about 274.4087218893.

Adding to 20663017 its reverse (71036602), we get a palindrome (91699619).

The spelling of 20663017 in words is "twenty million, six hundred sixty-three thousand, seventeen".