20395 has 4 divisors (see below), whose sum is σ = 24480.
Its totient is φ = 16312.
The previous prime is 20393. The next prime is 20399. The reversal of 20395 is 59302.
It is a semiprime because it is the product of two primes.
It is a cyclic number.
It is not a de Polignac number, because 20395 - 21 = 20393 is a prime.
It is a nialpdrome in base 12.
It is not an unprimeable number, because it can be changed into a prime (20393) 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, 2035 + ... + 2044.
It is an arithmetic number, because the mean of its divisors is an integer number (6120).
220395 is an apocalyptic number.
20395 is a deficient number, since it is larger than the sum of its proper divisors (4085).
20395 is an equidigital number, since it uses as much as digits as its factorization.
20395 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 4084.
The product of its (nonzero) digits is 270, while the sum is 19.
The square root of 20395 is about 142.8110639972.
The cubic root of 20395 is about 27.3217116302.
Adding to 20395 its reverse (59302), we get a palindrome (79697).
The spelling of 20395 in words is "twenty thousand, three hundred ninety-five".