C-V20 could very well indicate being very anciently European paternally. I'd be interested in your subclade result. Right now on FTDNA, most belong to the (obviously European) V222 subclade, with a small minority of Europeans in the Z29329 subclade, and a single person with a Berber surname in the Z38888 subclade. Z38888 is the most ancient known V20 subclade (next to La Brana's V20* V86- subclade), so that person, I assume a North African, likely descends from a very ancient migration to North Africa that we probably can't tie to a historical migration. Z38888 isn't dated on yfull, but could be anywhere from 43k to 16k years old per their numbers, so it may need more study before we can even say simple things about it like "it passed through Europe."
If you turn out to be Z38888 or a close cousin of it, I imagine that Haplogroup C specialists will be very interested in your results, and will want you to continue testing. If you turn out to be V222 instead, then at least you'll be more certain of the timeline when your paternal line migrated from Europe to North Africa.