No problem, we've got 3897 and 5185 to multiply
3897 × 5185 = 5185 × (3897)
+ 5185 × 7 giving us 36295
+ 5185 × 90 that equals 466650
+ 5185 × 800 yielding 4148000
+ 5185 × 3000 which equals 15555000

= 20205945
