No problem, we've got 4707 and 4387 to multiply
4707 × 4387 = 4387 × (4707)
+ 4387 × 7 which equals 30709
+ 4387 × 00 what gives us 0
+ 4387 × 700 yielding 3070900
+ 4387 × 4000 that equals 17548000

= 20649609
