20263863 has 16 divisors (see below), whose sum is σ = 28160000. Its totient is φ = 12947040.

The previous prime is 20263849. The next prime is 20263871. The reversal of 20263863 is 36836202.

It is not a de Polignac number, because 20263863 - 2⁹ = 20263351 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20263863.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20263843) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9138 + ... + 11136.

It is an arithmetic number, because the mean of its divisors is an integer number (1760000).

Almost surely, 2^20263863 is an apocalyptic number.

20263863 is a deficient number, since it is larger than the sum of its proper divisors (7896137).

20263863 is a wasteful number, since it uses less digits than its factorization.

20263863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2142.

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 20263863 is about 4501.5400697983. The cubic root of 20263863 is about 272.6302741014.

The spelling of 20263863 in words is "twenty million, two hundred sixty-three thousand, eight hundred sixty-three".