No problem, we've got 20563473 and 66957977 to multiply
20563473 × 66957977 = 66957977 × (20563473)
+ 66957977 × 3 giving us 200873931
+ 66957977 × 70 giving us 4687058390
+ 66957977 × 400 that is equal 26783190800
+ 66957977 × 3000 what gives us 200873931000
+ 66957977 × 60000 yielding 4017478620000
+ 66957977 × 500000 what gives us 33478988500000
+ 66957977 × 0000000 producing 0
+ 66957977 × 20000000 yielding 1339159540000000

= 1376888552174121
