Alright, let's work through 20712720 times 15827933 step by step
20712720 × 15827933 = 15827933 × (20712720)
+ 15827933 × 0 resulting in 0
+ 15827933 × 20 producing 316558660
+ 15827933 × 700 which equals 11079553100
+ 15827933 × 2000 resulting in 31655866000
+ 15827933 × 10000 giving us 158279330000
+ 15827933 × 700000 that is equal 11079553100000
+ 15827933 × 0000000 that equals 0
+ 15827933 × 20000000 that results in 316558660000000

= 327839544407760
