20212 has 12 divisors (see below), whose sum is σ = 36736.
Its totient is φ = 9720.
The previous prime is 20201. The next prime is 20219. The reversal of 20212 is 21202.
Adding to 20212 its reverse (21202), we get a palindrome (41414).
Subtracting 20212 from its reverse (21202), we obtain a triangular number (990 = T44).
It can be divided in two parts, 20 and 212, that added together give a palindrome (232).
It is a happy number.
It is a nialpdrome in base 12.
It is a junction number, because it is equal to n+sod(n) for n = 20195 and 20204.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (20219) by changing a digit.
20212 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, 43 + ... + 205.
220212 is an apocalyptic number.
It is an amenable number.
20212 is a deficient number, since it is larger than the sum of its proper divisors (16524).
20212 is a wasteful number, since it uses less digits than its factorization.
20212 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 198 (or 196 counting only the distinct ones).
The product of its (nonzero) digits is 8, while the sum is 7.
The square root of 20212 is about 142.1689136204.
The cubic root of 20212 is about 27.2397486901.
The spelling of 20212 in words is "twenty thousand, two hundred twelve", and thus it is an iban number.