21041405

素因数分解:

$5^1\times 7^1\times {\mathrm{11}}^1\times {\mathrm{31}}^1\times {\mathrm{41}}^1\times {\mathrm{43}}^1$

素因数の和:138

約数の個数: 64

約数和(自身を含む): 34062336

約数和(自身を除く): 13020931

約数列:

[1, 5, 7, 11, 31, 35, 41, 43, 55, 77, 155, 205, 215, 217, 287, 301, 341, 385, 451, 473, 1085, 1271, 1333, 1435, 1505, 1705, 1763, 2255, 2365, 2387, 3157, 3311, 6355, 6665, 8815, 8897, 9331, 11935, 12341, 13981, 14663, 15785, 16555, 19393, 44485, 46655, 54653, 61705, 69905, 73315, 96965, 97867, 102641, 135751, 273265, 382571, 489335, 513205, 601183, 678755, 1912855, 3005915, 4208281, 21041405]

約数ペア:

[(1, 21041405), (5, 4208281), (7, 3005915), (11, 1912855), (31, 678755), (35, 601183), (41, 513205), (43, 489335), (55, 382571), (77, 273265), (155, 135751), (205, 102641), (215, 97867), (217, 96965), (287, 73315), (301, 69905), (341, 61705), (385, 54653), (451, 46655), (473, 44485), (1085, 19393), (1271, 16555), (1333, 15785), (1435, 14663), (1505, 13981), (1705, 12341), (1763, 11935), (2255, 9331), (2365, 8897), (2387, 8815), (3157, 6665), (3311, 6355)]