No problem, we've got 20409072 and 19872311 to multiply
20409072 × 19872311 = 19872311 × (20409072)
+ 19872311 × 2 that results in 39744622
+ 19872311 × 70 resulting in 1391061770
+ 19872311 × 000 which equals 0
+ 19872311 × 9000 yielding 178850799000
+ 19872311 × 00000 that is equal 0
+ 19872311 × 400000 that equals 7948924400000
+ 19872311 × 0000000 giving us 0
+ 19872311 × 20000000 what gives us 397446220000000

= 405575426005392
