81381720

素因数分解:

$2^3\times 3^1\times 5^1\times 7^1\times {\mathrm{17}}^1\times {\mathrm{41}}^1\times {\mathrm{139}}^1$

素因数の和:218

約数の個数: 256

約数和(自身を含む): 304819200

約数和(自身を除く): 223437480

約数列:

[1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 14, 15, 17, 20, 21, 24, 28, 30, 34, 35, 40, 41, 42, 51, 56, 60, 68, 70, 82, 84, 85, 102, 105, 119, 120, 123, 136, 139, 140, 164, 168, 170, 204, 205, 210, 238, 246, 255, 278, 280, 287, 328, 340, 357, 408, 410, 417, 420, 476, 492, 510, 556, 574, 595, 615, 680, 695, 697, 714, 820, 834, 840, 861, 952, 973, 984, 1020, 1112, 1148, 1190, 1230, 1390, 1394, 1428, 1435, 1640, 1668, 1722, 1785, 1946, 2040, 2085, 2091, 2296, 2363, 2380, 2460, 2780, 2788, 2856, 2870, 2919, 3336, 3444, 3485, 3570, 3892, 4170, 4182, 4305, 4726, 4760, 4865, 4879, 4920, 5560, 5576, 5699, 5740, 5838, 6888, 6970, 7089, 7140, 7784, 8340, 8364, 8610, 9452, 9730, 9758, 10455, 11398, 11480, 11676, 11815, 13940, 14178, 14280, 14595, 14637, 16541, 16680, 16728, 17097, 17220, 18904, 19460, 19516, 20910, 22796, 23352, 23630, 24395, 27880, 28356, 28495, 29190, 29274, 33082, 34194, 34440, 35445, 38920, 39032, 39893, 41820, 45592, 47260, 48790, 49623, 56712, 56990, 58380, 58548, 66164, 68388, 70890, 73185, 79786, 82705, 83640, 85485, 94520, 96883, 97580, 99246, 113980, 116760, 117096, 119679, 132328, 136776, 141780, 146370, 159572, 165410, 170970, 193766, 195160, 198492, 199465, 227960, 239358, 248115, 283560, 290649, 292740, 319144, 330820, 341940, 387532, 396984, 398930, 478716, 484415, 496230, 581298, 585480, 598395, 661640, 678181, 683880, 775064, 797860, 957432, 968830, 992460, 1162596, 1196790, 1356362, 1453245, 1595720, 1937660, 1984920, 2034543, 2325192, 2393580, 2712724, 2906490, 3390905, 3875320, 4069086, 4787160, 5425448, 5812980, 6781810, 8138172, 10172715, 11625960, 13563620, 16276344, 20345430, 27127240, 40690860, 81381720]

約数ペア:

[(1, 81381720), (2, 40690860), (3, 27127240), (4, 20345430), (5, 16276344), (6, 13563620), (7, 11625960), (8, 10172715), (10, 8138172), (12, 6781810), (14, 5812980), (15, 5425448), (17, 4787160), (20, 4069086), (21, 3875320), (24, 3390905), (28, 2906490), (30, 2712724), (34, 2393580), (35, 2325192), (40, 2034543), (41, 1984920), (42, 1937660), (51, 1595720), (56, 1453245), (60, 1356362), (68, 1196790), (70, 1162596), (82, 992460), (84, 968830), (85, 957432), (102, 797860), (105, 775064), (119, 683880), (120, 678181), (123, 661640), (136, 598395), (139, 585480), (140, 581298), (164, 496230), (168, 484415), (170, 478716), (204, 398930), (205, 396984), (210, 387532), (238, 341940), (246, 330820), (255, 319144), (278, 292740), (280, 290649), (287, 283560), (328, 248115), (340, 239358), (357, 227960), (408, 199465), (410, 198492), (417, 195160), (420, 193766), (476, 170970), (492, 165410), (510, 159572), (556, 146370), (574, 141780), (595, 136776), (615, 132328), (680, 119679), (695, 117096), (697, 116760), (714, 113980), (820, 99246), (834, 97580), (840, 96883), (861, 94520), (952, 85485), (973, 83640), (984, 82705), (1020, 79786), (1112, 73185), (1148, 70890), (1190, 68388), (1230, 66164), (1390, 58548), (1394, 58380), (1428, 56990), (1435, 56712), (1640, 49623), (1668, 48790), (1722, 47260), (1785, 45592), (1946, 41820), (2040, 39893), (2085, 39032), (2091, 38920), (2296, 35445), (2363, 34440), (2380, 34194), (2460, 33082), (2780, 29274), (2788, 29190), (2856, 28495), (2870, 28356), (2919, 27880), (3336, 24395), (3444, 23630), (3485, 23352), (3570, 22796), (3892, 20910), (4170, 19516), (4182, 19460), (4305, 18904), (4726, 17220), (4760, 17097), (4865, 16728), (4879, 16680), (4920, 16541), (5560, 14637), (5576, 14595), (5699, 14280), (5740, 14178), (5838, 13940), (6888, 11815), (6970, 11676), (7089, 11480), (7140, 11398), (7784, 10455), (8340, 9758), (8364, 9730), (8610, 9452)]