20495880

素因数分解:

$2^3\times 3^2\times 5^1\times {\mathrm{17}}^2\times {\mathrm{197}}^1$

素因数の和:248

約数の個数: 144

約数和(自身を含む): 71119620

約数和(自身を除く): 50623740

約数列:

[1, 2, 3, 4, 5, 6, 8, 9, 10, 12, 15, 17, 18, 20, 24, 30, 34, 36, 40, 45, 51, 60, 68, 72, 85, 90, 102, 120, 136, 153, 170, 180, 197, 204, 255, 289, 306, 340, 360, 394, 408, 510, 578, 591, 612, 680, 765, 788, 867, 985, 1020, 1156, 1182, 1224, 1445, 1530, 1576, 1734, 1773, 1970, 2040, 2312, 2364, 2601, 2890, 2955, 3060, 3349, 3468, 3546, 3940, 4335, 4728, 5202, 5780, 5910, 6120, 6698, 6936, 7092, 7880, 8670, 8865, 10047, 10404, 11560, 11820, 13005, 13396, 14184, 16745, 17340, 17730, 20094, 20808, 23640, 26010, 26792, 30141, 33490, 34680, 35460, 40188, 50235, 52020, 56933, 60282, 66980, 70920, 80376, 100470, 104040, 113866, 120564, 133960, 150705, 170799, 200940, 227732, 241128, 284665, 301410, 341598, 401880, 455464, 512397, 569330, 602820, 683196, 853995, 1024794, 1138660, 1205640, 1366392, 1707990, 2049588, 2277320, 2561985, 3415980, 4099176, 5123970, 6831960, 10247940, 20495880]

約数ペア:

[(1, 20495880), (2, 10247940), (3, 6831960), (4, 5123970), (5, 4099176), (6, 3415980), (8, 2561985), (9, 2277320), (10, 2049588), (12, 1707990), (15, 1366392), (17, 1205640), (18, 1138660), (20, 1024794), (24, 853995), (30, 683196), (34, 602820), (36, 569330), (40, 512397), (45, 455464), (51, 401880), (60, 341598), (68, 301410), (72, 284665), (85, 241128), (90, 227732), (102, 200940), (120, 170799), (136, 150705), (153, 133960), (170, 120564), (180, 113866), (197, 104040), (204, 100470), (255, 80376), (289, 70920), (306, 66980), (340, 60282), (360, 56933), (394, 52020), (408, 50235), (510, 40188), (578, 35460), (591, 34680), (612, 33490), (680, 30141), (765, 26792), (788, 26010), (867, 23640), (985, 20808), (1020, 20094), (1156, 17730), (1182, 17340), (1224, 16745), (1445, 14184), (1530, 13396), (1576, 13005), (1734, 11820), (1773, 11560), (1970, 10404), (2040, 10047), (2312, 8865), (2364, 8670), (2601, 7880), (2890, 7092), (2955, 6936), (3060, 6698), (3349, 6120), (3468, 5910), (3546, 5780), (3940, 5202), (4335, 4728)]