21013020

素因数分解:

$2^2\times 3^4\times 5^1\times 7^1\times {\mathrm{17}}^1\times {\mathrm{109}}^1$

素因数の和:154

約数の個数: 240

約数和(自身を含む): 80498880

約数和(自身を除く): 59485860

約数列:

[1, 2, 3, 4, 5, 6, 7, 9, 10, 12, 14, 15, 17, 18, 20, 21, 27, 28, 30, 34, 35, 36, 42, 45, 51, 54, 60, 63, 68, 70, 81, 84, 85, 90, 102, 105, 108, 109, 119, 126, 135, 140, 153, 162, 170, 180, 189, 204, 210, 218, 238, 252, 255, 270, 306, 315, 324, 327, 340, 357, 378, 405, 420, 436, 459, 476, 510, 540, 545, 567, 595, 612, 630, 654, 714, 756, 763, 765, 810, 918, 945, 981, 1020, 1071, 1090, 1134, 1190, 1260, 1308, 1377, 1428, 1526, 1530, 1620, 1635, 1785, 1836, 1853, 1890, 1962, 2142, 2180, 2268, 2289, 2295, 2380, 2754, 2835, 2943, 3052, 3060, 3213, 3270, 3570, 3706, 3780, 3815, 3924, 4284, 4578, 4590, 4905, 5355, 5508, 5559, 5670, 5886, 6426, 6540, 6867, 6885, 7140, 7412, 7630, 8829, 9156, 9180, 9265, 9639, 9810, 10710, 11118, 11340, 11445, 11772, 12852, 12971, 13734, 13770, 14715, 15260, 16065, 16677, 17658, 18530, 19278, 19620, 20601, 21420, 22236, 22890, 25942, 27468, 27540, 27795, 29430, 32130, 33354, 34335, 35316, 37060, 38556, 38913, 41202, 44145, 45780, 48195, 50031, 51884, 55590, 58860, 61803, 64260, 64855, 66708, 68670, 77826, 82404, 83385, 88290, 96390, 100062, 103005, 111180, 116739, 123606, 129710, 137340, 150093, 155652, 166770, 176580, 192780, 194565, 200124, 206010, 233478, 247212, 250155, 259420, 300186, 309015, 333540, 350217, 389130, 412020, 466956, 500310, 583695, 600372, 618030, 700434, 750465, 778260, 1000620, 1050651, 1167390, 1236060, 1400868, 1500930, 1751085, 2101302, 2334780, 3001860, 3502170, 4202604, 5253255, 7004340, 10506510, 21013020]

約数ペア:

[(1, 21013020), (2, 10506510), (3, 7004340), (4, 5253255), (5, 4202604), (6, 3502170), (7, 3001860), (9, 2334780), (10, 2101302), (12, 1751085), (14, 1500930), (15, 1400868), (17, 1236060), (18, 1167390), (20, 1050651), (21, 1000620), (27, 778260), (28, 750465), (30, 700434), (34, 618030), (35, 600372), (36, 583695), (42, 500310), (45, 466956), (51, 412020), (54, 389130), (60, 350217), (63, 333540), (68, 309015), (70, 300186), (81, 259420), (84, 250155), (85, 247212), (90, 233478), (102, 206010), (105, 200124), (108, 194565), (109, 192780), (119, 176580), (126, 166770), (135, 155652), (140, 150093), (153, 137340), (162, 129710), (170, 123606), (180, 116739), (189, 111180), (204, 103005), (210, 100062), (218, 96390), (238, 88290), (252, 83385), (255, 82404), (270, 77826), (306, 68670), (315, 66708), (324, 64855), (327, 64260), (340, 61803), (357, 58860), (378, 55590), (405, 51884), (420, 50031), (436, 48195), (459, 45780), (476, 44145), (510, 41202), (540, 38913), (545, 38556), (567, 37060), (595, 35316), (612, 34335), (630, 33354), (654, 32130), (714, 29430), (756, 27795), (763, 27540), (765, 27468), (810, 25942), (918, 22890), (945, 22236), (981, 21420), (1020, 20601), (1071, 19620), (1090, 19278), (1134, 18530), (1190, 17658), (1260, 16677), (1308, 16065), (1377, 15260), (1428, 14715), (1526, 13770), (1530, 13734), (1620, 12971), (1635, 12852), (1785, 11772), (1836, 11445), (1853, 11340), (1890, 11118), (1962, 10710), (2142, 9810), (2180, 9639), (2268, 9265), (2289, 9180), (2295, 9156), (2380, 8829), (2754, 7630), (2835, 7412), (2943, 7140), (3052, 6885), (3060, 6867), (3213, 6540), (3270, 6426), (3570, 5886), (3706, 5670), (3780, 5559), (3815, 5508), (3924, 5355), (4284, 4905), (4578, 4590)]