Alright, let's work through 20179455 times 82186021 step by step
20179455 × 82186021 = 82186021 × (20179455)
+ 82186021 × 5 producing 410930105
+ 82186021 × 50 what gives us 4109301050
+ 82186021 × 400 what gives us 32874408400
+ 82186021 × 9000 that results in 739674189000
+ 82186021 × 70000 which equals 5753021470000
+ 82186021 × 100000 producing 8218602100000
+ 82186021 × 0000000 giving us 0
+ 82186021 × 20000000 giving us 1643720420000000

= 1658469112398555
