21998000

素因数分解:

$2^4\times 5^3\times {\mathrm{17}}^1\times {\mathrm{647}}^1$

素因数の和:687

約数の個数: 80

約数和(自身を含む): 56407104

約数和(自身を除く): 34409104

約数列:

[1, 2, 4, 5, 8, 10, 16, 17, 20, 25, 34, 40, 50, 68, 80, 85, 100, 125, 136, 170, 200, 250, 272, 340, 400, 425, 500, 647, 680, 850, 1000, 1294, 1360, 1700, 2000, 2125, 2588, 3235, 3400, 4250, 5176, 6470, 6800, 8500, 10352, 10999, 12940, 16175, 17000, 21998, 25880, 32350, 34000, 43996, 51760, 54995, 64700, 80875, 87992, 109990, 129400, 161750, 175984, 219980, 258800, 274975, 323500, 439960, 549950, 647000, 879920, 1099900, 1294000, 1374875, 2199800, 2749750, 4399600, 5499500, 10999000, 21998000]

約数ペア:

[(1, 21998000), (2, 10999000), (4, 5499500), (5, 4399600), (8, 2749750), (10, 2199800), (16, 1374875), (17, 1294000), (20, 1099900), (25, 879920), (34, 647000), (40, 549950), (50, 439960), (68, 323500), (80, 274975), (85, 258800), (100, 219980), (125, 175984), (136, 161750), (170, 129400), (200, 109990), (250, 87992), (272, 80875), (340, 64700), (400, 54995), (425, 51760), (500, 43996), (647, 34000), (680, 32350), (850, 25880), (1000, 21998), (1294, 17000), (1360, 16175), (1700, 12940), (2000, 10999), (2125, 10352), (2588, 8500), (3235, 6800), (3400, 6470), (4250, 5176)]