Alright, let's work through 20641735 times 79454068 step by step
20641735 × 79454068 = 79454068 × (20641735)
+ 79454068 × 5 that results in 397270340
+ 79454068 × 30 that equals 2383622040
+ 79454068 × 700 that is equal 55617847600
+ 79454068 × 1000 yielding 79454068000
+ 79454068 × 40000 what gives us 3178162720000
+ 79454068 × 600000 giving us 47672440800000
+ 79454068 × 0000000 producing 0
+ 79454068 × 20000000 resulting in 1589081360000000

= 1640069816327980
