Alright, let's work through 20430316 times 64148942 step by step
20430316 × 64148942 = 64148942 × (20430316)
+ 64148942 × 6 that results in 384893652
+ 64148942 × 10 that results in 641489420
+ 64148942 × 300 which equals 19244682600
+ 64148942 × 0000 which equals 0
+ 64148942 × 30000 what gives us 1924468260000
+ 64148942 × 400000 giving us 25659576800000
+ 64148942 × 0000000 that is equal 0
+ 64148942 × 20000000 producing 1282978840000000

= 1310583156125672
