20008663 has 2 divisors, whose sum is σ = 20008664. Its totient is φ = 20008662.

The previous prime is 20008657. The next prime is 20008669. The reversal of 20008663 is 36680002.

It is a balanced prime because it is at equal distance from previous prime (20008657) and next prime (20008669).

It is a cyclic number.

It is not a de Polignac number, because 20008663 - 2⁹ = 20008151 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20008669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10004331 + 10004332.

It is an arithmetic number, because the mean of its divisors is an integer number (10004332).

Almost surely, 2^20008663 is an apocalyptic number.

20008663 is a deficient number, since it is larger than the sum of its proper divisors (1).

20008663 is an equidigital number, since it uses as much as digits as its factorization.

20008663 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 20008663 is about 4473.1044029846. The cubic root of 20008663 is about 271.4809476686.

Adding to 20008663 its reverse (36680002), we get a palindrome (56688665).

The spelling of 20008663 in words is "twenty million, eight thousand, six hundred sixty-three".