21156925

素因数分解:

$5^2\times {\mathrm{17}}^1\times {\mathrm{67}}^1\times {\mathrm{743}}^1$

素因数の和:837

約数の個数: 24

約数和(自身を含む): 28230336

約数和(自身を除く): 7073411

約数列:

[1, 5, 17, 25, 67, 85, 335, 425, 743, 1139, 1675, 3715, 5695, 12631, 18575, 28475, 49781, 63155, 248905, 315775, 846277, 1244525, 4231385, 21156925]

約数ペア:

[(1, 21156925), (5, 4231385), (17, 1244525), (25, 846277), (67, 315775), (85, 248905), (335, 63155), (425, 49781), (743, 28475), (1139, 18575), (1675, 12631), (3715, 5695)]