20185 has 8 divisors (see below), whose sum is σ = 26496. Its totient is φ = 14640.

The previous prime is 20183. The next prime is 20201. The reversal of 20185 is 58102.

20185 = T₅₅ + T₅₆ + ... + T₆₅.

It is a happy number.

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

It is not a de Polignac number, because 20185 - 2¹ = 20183 is a prime.

It is a Duffinian number.

20185 is a modest number, since divided by 185 gives 20 as remainder.

20185 is a lucky number.

It is a nialpdrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (20183) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 129 + ... + 238.

It is an arithmetic number, because the mean of its divisors is an integer number (3312).

2²⁰¹⁸⁵ is an apocalyptic number.

It is an amenable number.

20185 is a deficient number, since it is larger than the sum of its proper divisors (6311).

20185 is a wasteful number, since it uses less digits than its factorization.

20185 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 383.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 20185 is about 142.0739244196. The cubic root of 20185 is about 27.2276139690.

Adding to 20185 its reverse (58102), we get a palindrome (78287).

The spelling of 20185 in words is "twenty thousand, one hundred eighty-five".