20187 has 6 divisors (see below), whose sum is σ = 29172.
Its totient is φ = 13452.
The previous prime is 20183. The next prime is 20201. The reversal of 20187 is 78102.
It is not a de Polignac number, because 20187 - 22 = 20183 is a prime.
It is a plaindrome in base 7.
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 5 ways as a sum of consecutive naturals, for example, 1113 + ... + 1130.
It is an arithmetic number, because the mean of its divisors is an integer number (4862).
220187 is an apocalyptic number.
20187 is a deficient number, since it is larger than the sum of its proper divisors (8985).
20187 is a wasteful number, since it uses less digits than its factorization.
20187 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 2249 (or 2246 counting only the distinct ones).
The product of its (nonzero) digits is 112, while the sum is 18.
The square root of 20187 is about 142.0809628346.
The cubic root of 20187 is about 27.2285132082.
Adding to 20187 its reverse (78102), we get a palindrome (98289).
It can be divided in two parts, 2018 and 7, that added together give a square (2025 = 452).
The spelling of 20187 in words is "twenty thousand, one hundred eighty-seven".