21806820

素因数分解:

$2^2\times 3^5\times 5^1\times 7^1\times {\mathrm{641}}^1$

素因数の和:672

約数の個数: 144

約数和(自身を含む): 78519168

約数和(自身を除く): 56712348

約数列:

[1, 2, 3, 4, 5, 6, 7, 9, 10, 12, 14, 15, 18, 20, 21, 27, 28, 30, 35, 36, 42, 45, 54, 60, 63, 70, 81, 84, 90, 105, 108, 126, 135, 140, 162, 180, 189, 210, 243, 252, 270, 315, 324, 378, 405, 420, 486, 540, 567, 630, 641, 756, 810, 945, 972, 1134, 1215, 1260, 1282, 1620, 1701, 1890, 1923, 2268, 2430, 2564, 2835, 3205, 3402, 3780, 3846, 4487, 4860, 5670, 5769, 6410, 6804, 7692, 8505, 8974, 9615, 11340, 11538, 12820, 13461, 17010, 17307, 17948, 19230, 22435, 23076, 26922, 28845, 34020, 34614, 38460, 40383, 44870, 51921, 53844, 57690, 67305, 69228, 80766, 86535, 89740, 103842, 115380, 121149, 134610, 155763, 161532, 173070, 201915, 207684, 242298, 259605, 269220, 311526, 346140, 363447, 403830, 484596, 519210, 605745, 623052, 726894, 778815, 807660, 1038420, 1090341, 1211490, 1453788, 1557630, 1817235, 2180682, 2422980, 3115260, 3634470, 4361364, 5451705, 7268940, 10903410, 21806820]

約数ペア:

[(1, 21806820), (2, 10903410), (3, 7268940), (4, 5451705), (5, 4361364), (6, 3634470), (7, 3115260), (9, 2422980), (10, 2180682), (12, 1817235), (14, 1557630), (15, 1453788), (18, 1211490), (20, 1090341), (21, 1038420), (27, 807660), (28, 778815), (30, 726894), (35, 623052), (36, 605745), (42, 519210), (45, 484596), (54, 403830), (60, 363447), (63, 346140), (70, 311526), (81, 269220), (84, 259605), (90, 242298), (105, 207684), (108, 201915), (126, 173070), (135, 161532), (140, 155763), (162, 134610), (180, 121149), (189, 115380), (210, 103842), (243, 89740), (252, 86535), (270, 80766), (315, 69228), (324, 67305), (378, 57690), (405, 53844), (420, 51921), (486, 44870), (540, 40383), (567, 38460), (630, 34614), (641, 34020), (756, 28845), (810, 26922), (945, 23076), (972, 22435), (1134, 19230), (1215, 17948), (1260, 17307), (1282, 17010), (1620, 13461), (1701, 12820), (1890, 11538), (1923, 11340), (2268, 9615), (2430, 8974), (2564, 8505), (2835, 7692), (3205, 6804), (3402, 6410), (3780, 5769), (3846, 5670), (4487, 4860)]