No problem, we've got 23400920 and 16982168 to multiply
23400920 × 16982168 = 16982168 × (23400920)
+ 16982168 × 0 what gives us 0
+ 16982168 × 20 what gives us 339643360
+ 16982168 × 900 giving us 15283951200
+ 16982168 × 0000 giving us 0
+ 16982168 × 00000 what gives us 0
+ 16982168 × 400000 giving us 6792867200000
+ 16982168 × 3000000 resulting in 50946504000000
+ 16982168 × 20000000 yielding 339643360000000

= 397398354794560
