Sorry to burst your bubble but getting 20 heads out of 20 tosses is obviously way less probable than let's say 10 heads. Not trying to feed conspiracy theorists but if you get 20 heads out of 20 tosses there's very high chance of coin being biased than it being random.
You might be misunderstanding me. Any combination of H/T in a specific sequence has the exact same probability of occurring (0.5)X. You are thinking of a standard distribution of the output, which would err towards the average (50/50) but in any given set of 3 flips:
HHH - 12.5% of occurring HTH - 12.5% of occurring TTT - 12.5% chance of occurring
So while 20 heads in a row is WEIRD, its the exact same likelihood as 5H/5T/5H/5T or H/T alternating. But we see 'weird' random outcomes as evidence that its not truly random.