19998545

素因数分解:

$5^1\times 7^1\times {\mathrm{17}}^1\times {\mathrm{19}}^1\times {\mathrm{29}}^1\times {\mathrm{61}}^1$

素因数の和:138

約数の個数: 64

約数和(自身を含む): 32140800

約数和(自身を除く): 12142255

約数列:

[1, 5, 7, 17, 19, 29, 35, 61, 85, 95, 119, 133, 145, 203, 305, 323, 427, 493, 551, 595, 665, 1015, 1037, 1159, 1615, 1769, 2135, 2261, 2465, 2755, 3451, 3857, 5185, 5795, 7259, 8113, 8845, 9367, 11305, 12383, 17255, 19285, 19703, 30073, 33611, 36295, 40565, 46835, 61915, 65569, 98515, 137921, 150365, 168055, 210511, 235277, 327845, 571387, 689605, 1052555, 1176385, 2856935, 3999709, 19998545]

約数ペア:

[(1, 19998545), (5, 3999709), (7, 2856935), (17, 1176385), (19, 1052555), (29, 689605), (35, 571387), (61, 327845), (85, 235277), (95, 210511), (119, 168055), (133, 150365), (145, 137921), (203, 98515), (305, 65569), (323, 61915), (427, 46835), (493, 40565), (551, 36295), (595, 33611), (665, 30073), (1015, 19703), (1037, 19285), (1159, 17255), (1615, 12383), (1769, 11305), (2135, 9367), (2261, 8845), (2465, 8113), (2755, 7259), (3451, 5795), (3857, 5185)]