Alright, let's work through 2357 times 8870 step by step
2357 × 8870 = 8870 × (2357)
+ 8870 × 7 that is equal 62090
+ 8870 × 50 which equals 443500
+ 8870 × 300 that equals 2661000
+ 8870 × 2000 yielding 17740000

= 20906590
