19915665

素因数分解:

$3^1\times 5^1\times 7^1\times {\mathrm{11}}^1\times {\mathrm{43}}^1\times {\mathrm{401}}^1$

素因数の和:470

約数の個数: 64

約数和(自身を含む): 40753152

約数和(自身を除く): 20837487

約数列:

[1, 3, 5, 7, 11, 15, 21, 33, 35, 43, 55, 77, 105, 129, 165, 215, 231, 301, 385, 401, 473, 645, 903, 1155, 1203, 1419, 1505, 2005, 2365, 2807, 3311, 4411, 4515, 6015, 7095, 8421, 9933, 13233, 14035, 16555, 17243, 22055, 30877, 42105, 49665, 51729, 66165, 86215, 92631, 120701, 154385, 189673, 258645, 362103, 463155, 569019, 603505, 948365, 1327711, 1810515, 2845095, 3983133, 6638555, 19915665]

約数ペア:

[(1, 19915665), (3, 6638555), (5, 3983133), (7, 2845095), (11, 1810515), (15, 1327711), (21, 948365), (33, 603505), (35, 569019), (43, 463155), (55, 362103), (77, 258645), (105, 189673), (129, 154385), (165, 120701), (215, 92631), (231, 86215), (301, 66165), (385, 51729), (401, 49665), (473, 42105), (645, 30877), (903, 22055), (1155, 17243), (1203, 16555), (1419, 14035), (1505, 13233), (2005, 9933), (2365, 8421), (2807, 7095), (3311, 6015), (4411, 4515)]