21651280

素因数分解:

$2^4\times 5^1\times 7^1\times {\mathrm{23}}^1\times {\mathrm{41}}^2$

素因数の和:125

約数の個数: 120

約数和(自身を含む): 61531776

約数和(自身を除く): 39880496

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 23, 28, 35, 40, 41, 46, 56, 70, 80, 82, 92, 112, 115, 140, 161, 164, 184, 205, 230, 280, 287, 322, 328, 368, 410, 460, 560, 574, 644, 656, 805, 820, 920, 943, 1148, 1288, 1435, 1610, 1640, 1681, 1840, 1886, 2296, 2576, 2870, 3220, 3280, 3362, 3772, 4592, 4715, 5740, 6440, 6601, 6724, 7544, 8405, 9430, 11480, 11767, 12880, 13202, 13448, 15088, 16810, 18860, 22960, 23534, 26404, 26896, 33005, 33620, 37720, 38663, 47068, 52808, 58835, 66010, 67240, 75440, 77326, 94136, 105616, 117670, 132020, 134480, 154652, 188272, 193315, 235340, 264040, 270641, 309304, 386630, 470680, 528080, 541282, 618608, 773260, 941360, 1082564, 1353205, 1546520, 2165128, 2706410, 3093040, 4330256, 5412820, 10825640, 21651280]

約数ペア:

[(1, 21651280), (2, 10825640), (4, 5412820), (5, 4330256), (7, 3093040), (8, 2706410), (10, 2165128), (14, 1546520), (16, 1353205), (20, 1082564), (23, 941360), (28, 773260), (35, 618608), (40, 541282), (41, 528080), (46, 470680), (56, 386630), (70, 309304), (80, 270641), (82, 264040), (92, 235340), (112, 193315), (115, 188272), (140, 154652), (161, 134480), (164, 132020), (184, 117670), (205, 105616), (230, 94136), (280, 77326), (287, 75440), (322, 67240), (328, 66010), (368, 58835), (410, 52808), (460, 47068), (560, 38663), (574, 37720), (644, 33620), (656, 33005), (805, 26896), (820, 26404), (920, 23534), (943, 22960), (1148, 18860), (1288, 16810), (1435, 15088), (1610, 13448), (1640, 13202), (1681, 12880), (1840, 11767), (1886, 11480), (2296, 9430), (2576, 8405), (2870, 7544), (3220, 6724), (3280, 6601), (3362, 6440), (3772, 5740), (4592, 4715)]