21008975

素因数分解:

$5^2\times {\mathrm{13}}^1\times {\mathrm{127}}^1\times {\mathrm{509}}^1$

素因数の和:659

約数の個数: 24

約数和(自身を含む): 28331520

約数和(自身を除く): 7322545

約数列:

[1, 5, 13, 25, 65, 127, 325, 509, 635, 1651, 2545, 3175, 6617, 8255, 12725, 33085, 41275, 64643, 165425, 323215, 840359, 1616075, 4201795, 21008975]

約数ペア:

[(1, 21008975), (5, 4201795), (13, 1616075), (25, 840359), (65, 323215), (127, 165425), (325, 64643), (509, 41275), (635, 33085), (1651, 12725), (2545, 8255), (3175, 6617)]