No, they are not linked - that is the gamblers fallacy.Quote from JSSPMK:
it is 50/50, but the 2 above questions are linked, it is exactly to do with the unlikely event of a run continueing that probability rises of an opposite event taking place.
You can't say that its is unlikely that the run will continue yet the odds on the next toss are 50/50 - that is an obvious contradiction.
You are confusing the odds of throwing 20 heads in a row (very unlikely) with the odds of throwing a single head after already having thrown 20 heads in a row (which is still 50/50).
Free your mind.