19987325

素因数分解:

$5^2\times {\mathrm{17}}^1\times {\mathrm{131}}^1\times {\mathrm{359}}^1$

素因数の和:517

約数の個数: 24

約数和(自身を含む): 26516160

約数和(自身を除く): 6528835

約数列:

[1, 5, 17, 25, 85, 131, 359, 425, 655, 1795, 2227, 3275, 6103, 8975, 11135, 30515, 47029, 55675, 152575, 235145, 799493, 1175725, 3997465, 19987325]

約数ペア:

[(1, 19987325), (5, 3997465), (17, 1175725), (25, 799493), (85, 235145), (131, 152575), (359, 55675), (425, 47029), (655, 30515), (1795, 11135), (2227, 8975), (3275, 6103)]