Alright, let's work through 20634501 times 19724034 step by step
20634501 × 19724034 = 19724034 × (20634501)
+ 19724034 × 1 yielding 19724034
+ 19724034 × 00 which equals 0
+ 19724034 × 500 which equals 9862017000
+ 19724034 × 4000 resulting in 78896136000
+ 19724034 × 30000 that equals 591721020000
+ 19724034 × 600000 that is equal 11834420400000
+ 19724034 × 0000000 that is equal 0
+ 19724034 × 20000000 yielding 394480680000000

= 406995599297034
