20816640

素因数分解:

$2^8\times 3^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{139}}^1$

素因数の和:179

約数の個数: 216

約数和(自身を含む): 78121680

約数和(自身を除く): 57305040

約数列:

[1, 2, 3, 4, 5, 6, 8, 9, 10, 12, 13, 15, 16, 18, 20, 24, 26, 30, 32, 36, 39, 40, 45, 48, 52, 60, 64, 65, 72, 78, 80, 90, 96, 104, 117, 120, 128, 130, 139, 144, 156, 160, 180, 192, 195, 208, 234, 240, 256, 260, 278, 288, 312, 320, 360, 384, 390, 416, 417, 468, 480, 520, 556, 576, 585, 624, 640, 695, 720, 768, 780, 832, 834, 936, 960, 1040, 1112, 1152, 1170, 1248, 1251, 1280, 1390, 1440, 1560, 1664, 1668, 1807, 1872, 1920, 2080, 2085, 2224, 2304, 2340, 2496, 2502, 2780, 2880, 3120, 3328, 3336, 3614, 3744, 3840, 4160, 4170, 4448, 4680, 4992, 5004, 5421, 5560, 5760, 6240, 6255, 6672, 7228, 7488, 8320, 8340, 8896, 9035, 9360, 9984, 10008, 10842, 11120, 11520, 12480, 12510, 13344, 14456, 14976, 16263, 16640, 16680, 17792, 18070, 18720, 20016, 21684, 22240, 24960, 25020, 26688, 27105, 28912, 29952, 32526, 33360, 35584, 36140, 37440, 40032, 43368, 44480, 49920, 50040, 53376, 54210, 57824, 65052, 66720, 72280, 74880, 80064, 81315, 86736, 88960, 100080, 106752, 108420, 115648, 130104, 133440, 144560, 149760, 160128, 162630, 173472, 177920, 200160, 216840, 231296, 260208, 266880, 289120, 320256, 325260, 346944, 400320, 433680, 462592, 520416, 533760, 578240, 650520, 693888, 800640, 867360, 1040832, 1156480, 1301040, 1387776, 1601280, 1734720, 2081664, 2312960, 2602080, 3469440, 4163328, 5204160, 6938880, 10408320, 20816640]

約数ペア:

[(1, 20816640), (2, 10408320), (3, 6938880), (4, 5204160), (5, 4163328), (6, 3469440), (8, 2602080), (9, 2312960), (10, 2081664), (12, 1734720), (13, 1601280), (15, 1387776), (16, 1301040), (18, 1156480), (20, 1040832), (24, 867360), (26, 800640), (30, 693888), (32, 650520), (36, 578240), (39, 533760), (40, 520416), (45, 462592), (48, 433680), (52, 400320), (60, 346944), (64, 325260), (65, 320256), (72, 289120), (78, 266880), (80, 260208), (90, 231296), (96, 216840), (104, 200160), (117, 177920), (120, 173472), (128, 162630), (130, 160128), (139, 149760), (144, 144560), (156, 133440), (160, 130104), (180, 115648), (192, 108420), (195, 106752), (208, 100080), (234, 88960), (240, 86736), (256, 81315), (260, 80064), (278, 74880), (288, 72280), (312, 66720), (320, 65052), (360, 57824), (384, 54210), (390, 53376), (416, 50040), (417, 49920), (468, 44480), (480, 43368), (520, 40032), (556, 37440), (576, 36140), (585, 35584), (624, 33360), (640, 32526), (695, 29952), (720, 28912), (768, 27105), (780, 26688), (832, 25020), (834, 24960), (936, 22240), (960, 21684), (1040, 20016), (1112, 18720), (1152, 18070), (1170, 17792), (1248, 16680), (1251, 16640), (1280, 16263), (1390, 14976), (1440, 14456), (1560, 13344), (1664, 12510), (1668, 12480), (1807, 11520), (1872, 11120), (1920, 10842), (2080, 10008), (2085, 9984), (2224, 9360), (2304, 9035), (2340, 8896), (2496, 8340), (2502, 8320), (2780, 7488), (2880, 7228), (3120, 6672), (3328, 6255), (3336, 6240), (3614, 5760), (3744, 5560), (3840, 5421), (4160, 5004), (4170, 4992), (4448, 4680)]