20801781

素因数分解:

$3^2\times 7^1\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{2309}}^1$

素因数の和:2346

約数の個数: 48

約数和(自身を含む): 40360320

約数和(自身を除く): 19558539

約数列:

[1, 3, 7, 9, 11, 13, 21, 33, 39, 63, 77, 91, 99, 117, 143, 231, 273, 429, 693, 819, 1001, 1287, 2309, 3003, 6927, 9009, 16163, 20781, 25399, 30017, 48489, 76197, 90051, 145467, 177793, 210119, 228591, 270153, 330187, 533379, 630357, 990561, 1600137, 1891071, 2311309, 2971683, 6933927, 20801781]

約数ペア:

[(1, 20801781), (3, 6933927), (7, 2971683), (9, 2311309), (11, 1891071), (13, 1600137), (21, 990561), (33, 630357), (39, 533379), (63, 330187), (77, 270153), (91, 228591), (99, 210119), (117, 177793), (143, 145467), (231, 90051), (273, 76197), (429, 48489), (693, 30017), (819, 25399), (1001, 20781), (1287, 16163), (2309, 9009), (3003, 6927)]