20636163 has 12 divisors (see below), whose sum is σ = 30143880. Its totient is φ = 13602336.

The previous prime is 20636159. The next prime is 20636183. The reversal of 20636163 is 36163602.

20636163 is a `hidden beast` number, since 20 + 636 + 1 + 6 + 3 = 666.

It is not a de Polignac number, because 20636163 - 2² = 20636159 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20636123) 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 in 11 ways as a sum of consecutive naturals, for example, 12081 + ... + 13682.

It is an arithmetic number, because the mean of its divisors is an integer number (2511990).

Almost surely, 2^20636163 is an apocalyptic number.

20636163 is a deficient number, since it is larger than the sum of its proper divisors (9507717).

20636163 is a wasteful number, since it uses less digits than its factorization.

20636163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25858 (or 25855 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 27.

The square root of 20636163 is about 4542.7043707466. The cubic root of 20636163 is about 274.2897949774.

Adding to 20636163 its reverse (36163602), we get a palindrome (56799765).

The spelling of 20636163 in words is "twenty million, six hundred thirty-six thousand, one hundred sixty-three".