20206 has 4 divisors (see below), whose sum is σ = 30312.
Its totient is φ = 10102.
The previous prime is 20201. The next prime is 20219. The reversal of 20206 is 60202.
It is a happy number.
It is a semiprime because it is the product of two primes.
It is a plaindrome in base 16.
It is a junction number, because it is equal to n+sod(n) for n = 20192 and 20201.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (20201) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5050 + ... + 5053.
It is an arithmetic number, because the mean of its divisors is an integer number (7578).
220206 is an apocalyptic number.
20206 is a deficient number, since it is larger than the sum of its proper divisors (10106).
20206 is a wasteful number, since it uses less digits than its factorization.
20206 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 10105.
The product of its (nonzero) digits is 24, while the sum is 10.
The square root of 20206 is about 142.1478103947.
The cubic root of 20206 is about 27.2370530197.
Adding to 20206 its reverse (60202), we get a palindrome (80408).
The spelling of 20206 in words is "twenty thousand, two hundred six".