Adding to 20412 its reverse (21402), we get a palindrome (41814).
Subtracting 20412 from its reverse (21402), we obtain a triangular number (990 = T44).
20412 is nontrivially palindromic in base 8.
It is a tau number, because it is divible by the number of its divisors (42).
It is a Leyland number of the form 93 + 39.
It is a nialpdrome in base 9, base 12 and base 14.
It is a congruent number.
It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 20412.
220412 is an apocalyptic number.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 20412, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30604).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
20412 is an equidigital number, since it uses as much as digits as its factorization.
20412 is an evil number, because the sum of its binary digits is even.
The square root of 20412 is about 142.8705707975. The cubic root of 20412 is about 27.3293007469.
The spelling of 20412 in words is "twenty thousand, four hundred twelve", and thus it is an iban number.