19990915

素因数分解:

$5^1\times 7^1\times {\mathrm{37}}^1\times {\mathrm{43}}^1\times {\mathrm{359}}^1$

素因数の和:451

約数の個数: 32

約数和(自身を含む): 28892160

約数和(自身を除く): 8901245

約数列:

[1, 5, 7, 35, 37, 43, 185, 215, 259, 301, 359, 1295, 1505, 1591, 1795, 2513, 7955, 11137, 12565, 13283, 15437, 55685, 66415, 77185, 92981, 108059, 464905, 540295, 571169, 2855845, 3998183, 19990915]

約数ペア:

[(1, 19990915), (5, 3998183), (7, 2855845), (35, 571169), (37, 540295), (43, 464905), (185, 108059), (215, 92981), (259, 77185), (301, 66415), (359, 55685), (1295, 15437), (1505, 13283), (1591, 12565), (1795, 11137), (2513, 7955)]