Of all my siblings, which I have many,
I am the number, wise old twenty.
I always wear, my long thin hat,
And stand on one leg, I've never sat.
I'm last of last, and last of first
I'm last of the best, and last of the worst.
Question : Who am I?
Shoot at me a thousand times and I may still survive;
one scratch from me and you will find your prospects take a dive.
Question: What am I?