21050505

素因数分解:

$3^2\times 5^1\times 7^1\times {\mathrm{17}}^1\times {\mathrm{3931}}^1$

素因数の和:3966

約数の個数: 48

約数和(自身を含む): 44164224

約数和(自身を除く): 23113719

約数列:

[1, 3, 5, 7, 9, 15, 17, 21, 35, 45, 51, 63, 85, 105, 119, 153, 255, 315, 357, 595, 765, 1071, 1785, 3931, 5355, 11793, 19655, 27517, 35379, 58965, 66827, 82551, 137585, 176895, 200481, 247653, 334135, 412755, 467789, 601443, 1002405, 1238265, 1403367, 2338945, 3007215, 4210101, 7016835, 21050505]

約数ペア:

[(1, 21050505), (3, 7016835), (5, 4210101), (7, 3007215), (9, 2338945), (15, 1403367), (17, 1238265), (21, 1002405), (35, 601443), (45, 467789), (51, 412755), (63, 334135), (85, 247653), (105, 200481), (119, 176895), (153, 137585), (255, 82551), (315, 66827), (357, 58965), (595, 35379), (765, 27517), (1071, 19655), (1785, 11793), (3931, 5355)]