21987749

素因数分解:

$7^1\times {\mathrm{17}}^1\times {\mathrm{43}}^1\times {\mathrm{4297}}^1$

素因数の和:4364

約数の個数: 16

約数和(自身を含む): 27232128

約数和(自身を除く): 5244379

約数列:

[1, 7, 17, 43, 119, 301, 731, 4297, 5117, 30079, 73049, 184771, 511343, 1293397, 3141107, 21987749]

約数ペア:

[(1, 21987749), (7, 3141107), (17, 1293397), (43, 511343), (119, 184771), (301, 73049), (731, 30079), (4297, 5117)]