Alright, let's work through 20290674 times 78986205 step by step
20290674 × 78986205 = 78986205 × (20290674)
+ 78986205 × 4 that is equal 315944820
+ 78986205 × 70 producing 5529034350
+ 78986205 × 600 that equals 47391723000
+ 78986205 × 0000 that is equal 0
+ 78986205 × 90000 giving us 7108758450000
+ 78986205 × 200000 producing 15797241000000
+ 78986205 × 0000000 what gives us 0
+ 78986205 × 20000000 giving us 1579724100000000

= 1602683336152170
