No problem, we've got 20100913 and 83622540 to multiply
20100913 × 83622540 = 83622540 × (20100913)
+ 83622540 × 3 that results in 250867620
+ 83622540 × 10 resulting in 836225400
+ 83622540 × 900 that equals 75260286000
+ 83622540 × 0000 that is equal 0
+ 83622540 × 00000 that is equal 0
+ 83622540 × 100000 yielding 8362254000000
+ 83622540 × 0000000 what gives us 0
+ 83622540 × 20000000 which equals 1672450800000000

= 1680889401379020
