21217581

素因数分解:

$3^2\times 7^1\times {\mathrm{11}}^1\times {\mathrm{17}}^1\times {\mathrm{1801}}^1$

素因数の和:1842

約数の個数: 48

約数和(自身を含む): 40480128

約数和(自身を除く): 19262547

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, 1801, 3927, 5403, 11781, 12607, 16209, 19811, 30617, 37821, 59433, 91851, 113463, 138677, 178299, 214319, 275553, 336787, 416031, 642957, 1010361, 1248093, 1928871, 2357509, 3031083, 7072527, 21217581]

約数ペア:

[(1, 21217581), (3, 7072527), (7, 3031083), (9, 2357509), (11, 1928871), (17, 1248093), (21, 1010361), (33, 642957), (51, 416031), (63, 336787), (77, 275553), (99, 214319), (119, 178299), (153, 138677), (187, 113463), (231, 91851), (357, 59433), (561, 37821), (693, 30617), (1071, 19811), (1309, 16209), (1683, 12607), (1801, 11781), (3927, 5403)]