19905886

素因数分解:

$2^1\times 7^1\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{61}}^1\times {\mathrm{163}}^1$

素因数の和:257

約数の個数: 64

約数和(自身を含む): 40997376

約数和(自身を除く): 21091490

約数列:

[1, 2, 7, 11, 13, 14, 22, 26, 61, 77, 91, 122, 143, 154, 163, 182, 286, 326, 427, 671, 793, 854, 1001, 1141, 1342, 1586, 1793, 2002, 2119, 2282, 3586, 4238, 4697, 5551, 8723, 9394, 9943, 11102, 12551, 14833, 17446, 19886, 23309, 25102, 29666, 46618, 61061, 69601, 109373, 122122, 129259, 139202, 163163, 218746, 258518, 326326, 765611, 904813, 1421849, 1531222, 1809626, 2843698, 9952943, 19905886]

約数ペア:

[(1, 19905886), (2, 9952943), (7, 2843698), (11, 1809626), (13, 1531222), (14, 1421849), (22, 904813), (26, 765611), (61, 326326), (77, 258518), (91, 218746), (122, 163163), (143, 139202), (154, 129259), (163, 122122), (182, 109373), (286, 69601), (326, 61061), (427, 46618), (671, 29666), (793, 25102), (854, 23309), (1001, 19886), (1141, 17446), (1342, 14833), (1586, 12551), (1793, 11102), (2002, 9943), (2119, 9394), (2282, 8723), (3586, 5551), (4238, 4697)]