20366 has 8 divisors (see below), whose sum is σ = 32400. Its totient is φ = 9568.

The previous prime is 20359. The next prime is 20369. The reversal of 20366 is 66302.

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

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a nialpdrome in base 12.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 20366.

It is not an unprimeable number, because it can be changed into a prime (20369) by changing a digit.

20366 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 266 + ... + 333.

It is an arithmetic number, because the mean of its divisors is an integer number (4050).

2²⁰³⁶⁶ is an apocalyptic number.

20366 is a deficient number, since it is larger than the sum of its proper divisors (12034).

20366 is a wasteful number, since it uses less digits than its factorization.

20366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 618.

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 20366 is about 142.7094951291. The cubic root of 20366 is about 27.3087557508.

Adding to 20366 its reverse (66302), we get a palindrome (86668).

The spelling of 20366 in words is "twenty thousand, three hundred sixty-six".