However for your question :
Is is so that reward jumps to 20001 oins per block and example for block 20100 reward is 20100?
The answer is yes. On Block 20001 the block reward step to 20001KMC and then increase gradually until a peak of 100k per block. In this period from block 20001 to block 100k, BLOCK REWARD WILL BE EQUAL (THE SAME AS) to BLOCK'S HEIGHT or i.e. : block 54567 will have a reward of 54567 KMC; block 99k will have 99000KMC of block reward, and so on. Have you got it now?
Thank your explanation, now it is exactly clear. Also it is as I suspect but after looking image and information texts I was some amount confused.
(after block 20001 your image is just ok. But before this point I think stairs shape line is better (but now it is not important because tomorrow this part of image is just null and void.)
So, block reward is now - as we all know - 2000 KMC. (not 2500 as in image -and all miners know it of course)
It stay 2000 KMC up to block height 20000. After then it jump directly to 20001 KMC for block 20001 and after then reward amount is same as block height - up to block height 150000.
This step from 2000 to 20001 is quite big step but after then it rise smoothly.
What are these "mine and fast dump" peoples doing... this we know after some days/weeks. I hope that bad effect is only short time.