20989500

素因数分解:

$2^2\times 3^1\times 5^3\times 7^1\times {\mathrm{1999}}^1$

素因数の和:2028

約数の個数: 96

約数和(自身を含む): 69888000

約数和(自身を除く): 48898500

約数列:

[1, 2, 3, 4, 5, 6, 7, 10, 12, 14, 15, 20, 21, 25, 28, 30, 35, 42, 50, 60, 70, 75, 84, 100, 105, 125, 140, 150, 175, 210, 250, 300, 350, 375, 420, 500, 525, 700, 750, 875, 1050, 1500, 1750, 1999, 2100, 2625, 3500, 3998, 5250, 5997, 7996, 9995, 10500, 11994, 13993, 19990, 23988, 27986, 29985, 39980, 41979, 49975, 55972, 59970, 69965, 83958, 99950, 119940, 139930, 149925, 167916, 199900, 209895, 249875, 279860, 299850, 349825, 419790, 499750, 599700, 699650, 749625, 839580, 999500, 1049475, 1399300, 1499250, 1749125, 2098950, 2998500, 3498250, 4197900, 5247375, 6996500, 10494750, 20989500]

約数ペア:

[(1, 20989500), (2, 10494750), (3, 6996500), (4, 5247375), (5, 4197900), (6, 3498250), (7, 2998500), (10, 2098950), (12, 1749125), (14, 1499250), (15, 1399300), (20, 1049475), (21, 999500), (25, 839580), (28, 749625), (30, 699650), (35, 599700), (42, 499750), (50, 419790), (60, 349825), (70, 299850), (75, 279860), (84, 249875), (100, 209895), (105, 199900), (125, 167916), (140, 149925), (150, 139930), (175, 119940), (210, 99950), (250, 83958), (300, 69965), (350, 59970), (375, 55972), (420, 49975), (500, 41979), (525, 39980), (700, 29985), (750, 27986), (875, 23988), (1050, 19990), (1500, 13993), (1750, 11994), (1999, 10500), (2100, 9995), (2625, 7996), (3500, 5997), (3998, 5250)]