Alright, let's work through 20448008 times 82521404 step by step
20448008 × 82521404 = 82521404 × (20448008)
+ 82521404 × 8 producing 660171232
+ 82521404 × 00 producing 0
+ 82521404 × 000 resulting in 0
+ 82521404 × 8000 resulting in 660171232000
+ 82521404 × 40000 yielding 3300856160000
+ 82521404 × 400000 resulting in 33008561600000
+ 82521404 × 0000000 producing 0
+ 82521404 × 20000000 that equals 1650428080000000

= 1687398329163232
