20166 has 8 divisors (see below), whose sum is σ = 40344. Its totient is φ = 6720.

The previous prime is 20161. The next prime is 20173. The reversal of 20166 is 66102.

20166 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

20166 is an admirable number.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 1675 + ... + 1686.

It is an arithmetic number, because the mean of its divisors is an integer number (5043).

2²⁰¹⁶⁶ is an apocalyptic number.

20166 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20172).

20166 is a wasteful number, since it uses less digits than its factorization.

20166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3366.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 20166 is about 142.0070420789. The cubic root of 20166 is about 27.2190682326.

Adding to 20166 its reverse (66102), we get a palindrome (86268).

The spelling of 20166 in words is "twenty thousand, one hundred sixty-six".