20497000

素因数分解:

$2^3\times 5^3\times {\mathrm{103}}^1\times {\mathrm{199}}^1$

素因数の和:323

約数の個数: 64

約数和(自身を含む): 48672000

約数和(自身を除く): 28175000

約数列:

[1, 2, 4, 5, 8, 10, 20, 25, 40, 50, 100, 103, 125, 199, 200, 206, 250, 398, 412, 500, 515, 796, 824, 995, 1000, 1030, 1592, 1990, 2060, 2575, 3980, 4120, 4975, 5150, 7960, 9950, 10300, 12875, 19900, 20497, 20600, 24875, 25750, 39800, 40994, 49750, 51500, 81988, 99500, 102485, 103000, 163976, 199000, 204970, 409940, 512425, 819880, 1024850, 2049700, 2562125, 4099400, 5124250, 10248500, 20497000]

約数ペア:

[(1, 20497000), (2, 10248500), (4, 5124250), (5, 4099400), (8, 2562125), (10, 2049700), (20, 1024850), (25, 819880), (40, 512425), (50, 409940), (100, 204970), (103, 199000), (125, 163976), (199, 103000), (200, 102485), (206, 99500), (250, 81988), (398, 51500), (412, 49750), (500, 40994), (515, 39800), (796, 25750), (824, 24875), (995, 20600), (1000, 20497), (1030, 19900), (1592, 12875), (1990, 10300), (2060, 9950), (2575, 7960), (3980, 5150), (4120, 4975)]