20163863 has 2 divisors, whose sum is σ = 20163864. Its totient is φ = 20163862.

The previous prime is 20163839. The next prime is 20163889. The reversal of 20163863 is 36836102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20163863 - 2¹² = 20159767 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20163463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10081931 + 10081932.

It is an arithmetic number, because the mean of its divisors is an integer number (10081932).

Almost surely, 2^20163863 is an apocalyptic number.

20163863 is a deficient number, since it is larger than the sum of its proper divisors (1).

20163863 is an equidigital number, since it uses as much as digits as its factorization.

20163863 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 20163863 is about 4490.4190227639. The cubic root of 20163863 is about 272.1810672633.

Adding to 20163863 its reverse (36836102), we get a palindrome (56999965).

The spelling of 20163863 in words is "twenty million, one hundred sixty-three thousand, eight hundred sixty-three".