It is 200000000.
200000000 + 20000000 = 220000000
12222222 x 200000000 = 2444444400000000
382930400239 − 200000000 = 382730400239
200000000 x 20000000 = 4,000,000,000,000,000 (4 quadrillion)
200000000
200000000
500
2,800,000,000
-199,999,999
200000000
799,800,000,000,000