Let's calculate 20378849 x 63456987
20378849 × 63456987 = 63456987 × (20378849)
+ 63456987 × 9 yielding 571112883
+ 63456987 × 40 yielding 2538279480
+ 63456987 × 800 giving us 50765589600
+ 63456987 × 8000 resulting in 507655896000
+ 63456987 × 70000 that equals 4441989090000
+ 63456987 × 300000 that results in 19037096100000
+ 63456987 × 0000000 that is equal 0
+ 63456987 × 20000000 giving us 1269139740000000

= 1293180356067963
