20991889255

素因数分解:

$5^1\times {\mathrm{17}}^2\times {\mathrm{331}}^1\times {\mathrm{43889}}^1$

素因数の和:44259

約数の個数: 24

約数和(自身を含む): 26840666160

約数和(自身を除く): 5848776905

約数列:

[1, 5, 17, 85, 289, 331, 1445, 1655, 5627, 28135, 43889, 95659, 219445, 478295, 746113, 3730565, 12683921, 14527259, 63419605, 72636295, 246963403, 1234817015, 4198377851, 20991889255]

約数ペア:

[(1, 20991889255), (5, 4198377851), (17, 1234817015), (85, 246963403), (289, 72636295), (331, 63419605), (1445, 14527259), (1655, 12683921), (5627, 3730565), (28135, 746113), (43889, 478295), (95659, 219445)]