Adding to 20140 its reverse (4102), we get a palindrome (24242).
It is an Ulam number.
220140 is an apocalyptic number.
20140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 20140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22680).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
20140 is a wasteful number, since it uses less digits than its factorization.
20140 is an evil number, because the sum of its binary digits is even.
The square root of 20140 is about 141.9154677969. The cubic root of 20140 is about 27.2073653641.
The spelling of 20140 in words is "twenty thousand, one hundred forty", and thus it is an iban number.