20135663 has 8 divisors (see below), whose sum is σ = 20621136. Its totient is φ = 19656000.

The previous prime is 20135651. The next prime is 20135669. The reversal of 20135663 is 36653102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20135663 - 2¹⁸ = 19873519 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20135669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6008 + ... + 8738.

It is an arithmetic number, because the mean of its divisors is an integer number (2577642).

Almost surely, 2^20135663 is an apocalyptic number.

20135663 is a deficient number, since it is larger than the sum of its proper divisors (485473).

20135663 is a wasteful number, since it uses less digits than its factorization.

20135663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2905.

The product of its (nonzero) digits is 3240, while the sum is 26.

The square root of 20135663 is about 4487.2779053676. The cubic root of 20135663 is about 272.0541225561.

Adding to 20135663 its reverse (36653102), we get a palindrome (56788765).

The spelling of 20135663 in words is "twenty million, one hundred thirty-five thousand, six hundred sixty-three".