No problem, we've got 20324784 and 40067981 to multiply
20324784 × 40067981 = 40067981 × (20324784)
+ 40067981 × 4 which equals 160271924
+ 40067981 × 80 what gives us 3205438480
+ 40067981 × 700 yielding 28047586700
+ 40067981 × 4000 producing 160271924000
+ 40067981 × 20000 what gives us 801359620000
+ 40067981 × 300000 what gives us 12020394300000
+ 40067981 × 0000000 which equals 0
+ 40067981 × 20000000 producing 801359620000000

= 814373059141104
