21071075

素因数分解:

$5^2\times {\mathrm{17}}^1\times {\mathrm{43}}^1\times {\mathrm{1153}}^1$

素因数の和:1223

約数の個数: 24

約数和(自身を含む): 28333008

約数和(自身を除く): 7261933

約数列:

[1, 5, 17, 25, 43, 85, 215, 425, 731, 1075, 1153, 3655, 5765, 18275, 19601, 28825, 49579, 98005, 247895, 490025, 842843, 1239475, 4214215, 21071075]

約数ペア:

[(1, 21071075), (5, 4214215), (17, 1239475), (25, 842843), (43, 490025), (85, 247895), (215, 98005), (425, 49579), (731, 28825), (1075, 19601), (1153, 18275), (3655, 5765)]