It was a real snow job.

Between 660 and 720 Sanitation workers called in sick for the cleanup of last week’s blizzard — more than double the usual rate, The Post has learned.

About 11 to 12 percent of the Sanitation Department’s 6,000-strong force didn’t show up for work on Monday or Tuesday, city officials confirmed, as 20 inches of snow brought the Apple to a near-standstill.

The spotty snow response sparked reports of a deliberate slowdown by some Sanitation supervisors angered by City Hall cost-cutting measures. The Department of Investigation is looking into the allegations.