20836863 has 12 divisors (see below), whose sum is σ = 31682040. Its totient is φ = 13160016.

The previous prime is 20836847. The next prime is 20836889. The reversal of 20836863 is 36863802.

It is not a de Polignac number, because 20836863 - 2⁴ = 20836847 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20836063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 60756 + ... + 61097.

It is an arithmetic number, because the mean of its divisors is an integer number (2640170).

Almost surely, 2^20836863 is an apocalyptic number.

20836863 is a deficient number, since it is larger than the sum of its proper divisors (10845177).

20836863 is a wasteful number, since it uses less digits than its factorization.

20836863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121878 (or 121875 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The square root of 20836863 is about 4564.7412851113. The cubic root of 20836863 is about 275.1761428004.

The spelling of 20836863 in words is "twenty million, eight hundred thirty-six thousand, eight hundred sixty-three".