No problem, we've got 5487 and 3645 to multiply
5487 × 3645 = 3645 × (5487)
+ 3645 × 7 giving us 25515
+ 3645 × 80 that equals 291600
+ 3645 × 400 which equals 1458000
+ 3645 × 5000 which equals 18225000

= 20000115
