21005523

素因数分解:

$3^2\times 7^1\times {\mathrm{11}}^1\times {\mathrm{17}}^1\times {\mathrm{1783}}^1$

素因数の和:1824

約数の個数: 48

約数和(自身を含む): 40075776

約数和(自身を除く): 19070253

約数列:

[1, 3, 7, 9, 11, 17, 21, 33, 51, 63, 77, 99, 119, 153, 187, 231, 357, 561, 693, 1071, 1309, 1683, 1783, 3927, 5349, 11781, 12481, 16047, 19613, 30311, 37443, 58839, 90933, 112329, 137291, 176517, 212177, 272799, 333421, 411873, 636531, 1000263, 1235619, 1909593, 2333947, 3000789, 7001841, 21005523]

約数ペア:

[(1, 21005523), (3, 7001841), (7, 3000789), (9, 2333947), (11, 1909593), (17, 1235619), (21, 1000263), (33, 636531), (51, 411873), (63, 333421), (77, 272799), (99, 212177), (119, 176517), (153, 137291), (187, 112329), (231, 90933), (357, 58839), (561, 37443), (693, 30311), (1071, 19613), (1309, 16047), (1683, 12481), (1783, 11781), (3927, 5349)]