81921280

素因数分解:

$2^8\times 5^1\times 7^1\times {\mathrm{41}}^1\times {\mathrm{223}}^1$

素因数の和:292

約数の個数: 144

約数和(自身を含む): 230759424

約数和(自身を除く): 148838144

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 32, 35, 40, 41, 56, 64, 70, 80, 82, 112, 128, 140, 160, 164, 205, 223, 224, 256, 280, 287, 320, 328, 410, 446, 448, 560, 574, 640, 656, 820, 892, 896, 1115, 1120, 1148, 1280, 1312, 1435, 1561, 1640, 1784, 1792, 2230, 2240, 2296, 2624, 2870, 3122, 3280, 3568, 4460, 4480, 4592, 5248, 5740, 6244, 6560, 7136, 7805, 8920, 8960, 9143, 9184, 10496, 11480, 12488, 13120, 14272, 15610, 17840, 18286, 18368, 22960, 24976, 26240, 28544, 31220, 35680, 36572, 36736, 45715, 45920, 49952, 52480, 57088, 62440, 64001, 71360, 73144, 73472, 91430, 91840, 99904, 124880, 128002, 142720, 146288, 182860, 183680, 199808, 249760, 256004, 285440, 292576, 320005, 365720, 367360, 399616, 499520, 512008, 585152, 640010, 731440, 999040, 1024016, 1170304, 1280020, 1462880, 1998080, 2048032, 2340608, 2560040, 2925760, 4096064, 5120080, 5851520, 8192128, 10240160, 11703040, 16384256, 20480320, 40960640, 81921280]

約数ペア:

[(1, 81921280), (2, 40960640), (4, 20480320), (5, 16384256), (7, 11703040), (8, 10240160), (10, 8192128), (14, 5851520), (16, 5120080), (20, 4096064), (28, 2925760), (32, 2560040), (35, 2340608), (40, 2048032), (41, 1998080), (56, 1462880), (64, 1280020), (70, 1170304), (80, 1024016), (82, 999040), (112, 731440), (128, 640010), (140, 585152), (160, 512008), (164, 499520), (205, 399616), (223, 367360), (224, 365720), (256, 320005), (280, 292576), (287, 285440), (320, 256004), (328, 249760), (410, 199808), (446, 183680), (448, 182860), (560, 146288), (574, 142720), (640, 128002), (656, 124880), (820, 99904), (892, 91840), (896, 91430), (1115, 73472), (1120, 73144), (1148, 71360), (1280, 64001), (1312, 62440), (1435, 57088), (1561, 52480), (1640, 49952), (1784, 45920), (1792, 45715), (2230, 36736), (2240, 36572), (2296, 35680), (2624, 31220), (2870, 28544), (3122, 26240), (3280, 24976), (3568, 22960), (4460, 18368), (4480, 18286), (4592, 17840), (5248, 15610), (5740, 14272), (6244, 13120), (6560, 12488), (7136, 11480), (7805, 10496), (8920, 9184), (8960, 9143)]