20163 has 16 divisors (see below), whose sum is σ = 32256. Its totient is φ = 11040.

The previous prime is 20161. The next prime is 20173. The reversal of 20163 is 36102.

It is a Cunningham number, because it is equal to 142²-1.

It is not a de Polignac number, because 20163 - 2¹ = 20161 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20161) 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, 406 + ... + 452.

It is an arithmetic number, because the mean of its divisors is an integer number (2016).

2²⁰¹⁶³ is an apocalyptic number.

20163 is a deficient number, since it is larger than the sum of its proper divisors (12093).

20163 is a wasteful number, since it uses less digits than its factorization.

20163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74.

The product of its (nonzero) digits is 36, while the sum is 12.

The square root of 20163 is about 141.9964788296. The cubic root of 20163 is about 27.2177184151.

Adding to 20163 its reverse (36102), we get a palindrome (56265).

The spelling of 20163 in words is "twenty thousand, one hundred sixty-three".