21661587

素因数分解:

$3^4\times {\mathrm{17}}^1\times {\mathrm{15731}}^1$

素因数の和:15760

約数の個数: 20

約数和(自身を含む): 34264296

約数和(自身を除く): 12602709

約数列:

[1, 3, 9, 17, 27, 51, 81, 153, 459, 1377, 15731, 47193, 141579, 267427, 424737, 802281, 1274211, 2406843, 7220529, 21661587]

約数ペア:

[(1, 21661587), (3, 7220529), (9, 2406843), (17, 1274211), (27, 802281), (51, 424737), (81, 267427), (153, 141579), (459, 47193), (1377, 15731)]