Alright, let's work through 20021504 times 91430604 step by step
20021504 × 91430604 = 91430604 × (20021504)
+ 91430604 × 4 which equals 365722416
+ 91430604 × 00 producing 0
+ 91430604 × 500 resulting in 45715302000
+ 91430604 × 1000 resulting in 91430604000
+ 91430604 × 20000 that is equal 1828612080000
+ 91430604 × 000000 resulting in 0
+ 91430604 × 0000000 that is equal 0
+ 91430604 × 20000000 producing 1828612080000000

= 1830578203708416
