21407675

素因数分解:

$5^2\times {\mathrm{17}}^2\times {\mathrm{2963}}^1$

素因数の和:3007

約数の個数: 18

約数和(自身を含む): 28208388

約数和(自身を除く): 6800713

約数列:

[1, 5, 17, 25, 85, 289, 425, 1445, 2963, 7225, 14815, 50371, 74075, 251855, 856307, 1259275, 4281535, 21407675]

約数ペア:

[(1, 21407675), (5, 4281535), (17, 1259275), (25, 856307), (85, 251855), (289, 74075), (425, 50371), (1445, 14815), (2963, 7225)]