19978245

素因数分解:

$3^9\times 5^1\times 7^1\times {\mathrm{29}}^1$

素因数の和:68

約数の個数: 80

約数和(自身を含む): 42514560

約数和(自身を除く): 22536315

約数列:

[1, 3, 5, 7, 9, 15, 21, 27, 29, 35, 45, 63, 81, 87, 105, 135, 145, 189, 203, 243, 261, 315, 405, 435, 567, 609, 729, 783, 945, 1015, 1215, 1305, 1701, 1827, 2187, 2349, 2835, 3045, 3645, 3915, 5103, 5481, 6561, 7047, 8505, 9135, 10935, 11745, 15309, 16443, 19683, 21141, 25515, 27405, 32805, 35235, 45927, 49329, 63423, 76545, 82215, 98415, 105705, 137781, 147987, 190269, 229635, 246645, 317115, 443961, 570807, 688905, 739935, 951345, 1331883, 2219805, 2854035, 3995649, 6659415, 19978245]

約数ペア:

[(1, 19978245), (3, 6659415), (5, 3995649), (7, 2854035), (9, 2219805), (15, 1331883), (21, 951345), (27, 739935), (29, 688905), (35, 570807), (45, 443961), (63, 317115), (81, 246645), (87, 229635), (105, 190269), (135, 147987), (145, 137781), (189, 105705), (203, 98415), (243, 82215), (261, 76545), (315, 63423), (405, 49329), (435, 45927), (567, 35235), (609, 32805), (729, 27405), (783, 25515), (945, 21141), (1015, 19683), (1215, 16443), (1305, 15309), (1701, 11745), (1827, 10935), (2187, 9135), (2349, 8505), (2835, 7047), (3045, 6561), (3645, 5481), (3915, 5103)]