21531605

素因数分解:

$5^1\times {\mathrm{17}}^1\times {\mathrm{43}}^2\times {\mathrm{137}}^1$

素因数の和:245

約数の個数: 24

約数和(自身を含む): 28213272

約数和(自身を除く): 6681667

約数列:

[1, 5, 17, 43, 85, 137, 215, 685, 731, 1849, 2329, 3655, 5891, 9245, 11645, 29455, 31433, 100147, 157165, 253313, 500735, 1266565, 4306321, 21531605]

約数ペア:

[(1, 21531605), (5, 4306321), (17, 1266565), (43, 500735), (85, 253313), (137, 157165), (215, 100147), (685, 31433), (731, 29455), (1849, 11645), (2329, 9245), (3655, 5891)]