No problem, we've got 20997105 and 40807244 to multiply
20997105 × 40807244 = 40807244 × (20997105)
+ 40807244 × 5 which equals 204036220
+ 40807244 × 00 that is equal 0
+ 40807244 × 100 resulting in 4080724400
+ 40807244 × 7000 that results in 285650708000
+ 40807244 × 90000 resulting in 3672651960000
+ 40807244 × 900000 which equals 36726519600000
+ 40807244 × 0000000 yielding 0
+ 40807244 × 20000000 resulting in 816144880000000

= 856833987028620
