1280020

素因数分解:

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

素因数の和:280

約数の個数: 48

約数和(自身を含む): 3161088

約数和(自身を除く): 1881068

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 41, 70, 82, 140, 164, 205, 223, 287, 410, 446, 574, 820, 892, 1115, 1148, 1435, 1561, 2230, 2870, 3122, 4460, 5740, 6244, 7805, 9143, 15610, 18286, 31220, 36572, 45715, 64001, 91430, 128002, 182860, 256004, 320005, 640010, 1280020]

約数ペア:

[(1, 1280020), (2, 640010), (4, 320005), (5, 256004), (7, 182860), (10, 128002), (14, 91430), (20, 64001), (28, 45715), (35, 36572), (41, 31220), (70, 18286), (82, 15610), (140, 9143), (164, 7805), (205, 6244), (223, 5740), (287, 4460), (410, 3122), (446, 2870), (574, 2230), (820, 1561), (892, 1435), (1115, 1148)]