No problem, we've got 19934943 and 19967705 to multiply
19934943 × 19967705 = 19967705 × (19934943)
+ 19967705 × 3 that is equal 59903115
+ 19967705 × 40 that is equal 798708200
+ 19967705 × 900 giving us 17970934500
+ 19967705 × 4000 that results in 79870820000
+ 19967705 × 30000 that equals 599031150000
+ 19967705 × 900000 that is equal 17970934500000
+ 19967705 × 9000000 resulting in 179709345000000
+ 19967705 × 10000000 that equals 199677050000000

= 398055061015815
