Answer
Multiples of 820 are:
820, 1640, 2460, 3280, 4100, 4920, 5740, 6560, 7380, 8200, 9020, 9840, 10660, 11480, 12300, 13120, 13940, 14760, 15580, 16400, 17220, 18040, 18860, 19680, 20500, 21320, 22140, 22960, 23780, 24600, 25420, 26240, 27060, 27880, 28700, 29520, 30340, 31160, 31980, 32800, 33620, 34440, 35260, 36080, 36900, 37720, 38540, 39360, 40180
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