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Panzerkom wins! 
Su-17 was the name which Soviet union used in it's own FA planes. For export, names Su-20 and Su-22 were used. The "hump" is in Su-17M2 onwards. Su-20 was essentially same as Su-17M, Su-22 was same as Su-17M2 and Su-22M3/4 same as Su-17M3/4
Su-19 was never used for this aircraft. It's sometimes refered for the orginal name for Su-24 or modernised variant of Su-15.
Is it a minesweeper