No problem, we've got 18080406 and 20819345 to multiply
18080406 × 20819345 = 20819345 × (18080406)
+ 20819345 × 6 what gives us 124916070
+ 20819345 × 00 what gives us 0
+ 20819345 × 400 yielding 8327738000
+ 20819345 × 0000 yielding 0
+ 20819345 × 80000 what gives us 1665547600000
+ 20819345 × 000000 that is equal 0
+ 20819345 × 8000000 that is equal 166554760000000
+ 20819345 × 10000000 producing 208193450000000

= 376422210254070
