21987511

素因数分解:

$7^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{61}}^1\times {\mathrm{233}}^1$

素因数の和:331

約数の個数: 32

約数和(自身を含む): 29248128

約数和(自身を除く): 7260617

約数列:

[1, 7, 13, 17, 61, 91, 119, 221, 233, 427, 793, 1037, 1547, 1631, 3029, 3961, 5551, 7259, 13481, 14213, 21203, 27727, 51493, 94367, 99491, 184769, 241621, 360451, 1293383, 1691347, 3141073, 21987511]

約数ペア:

[(1, 21987511), (7, 3141073), (13, 1691347), (17, 1293383), (61, 360451), (91, 241621), (119, 184769), (221, 99491), (233, 94367), (427, 51493), (793, 27727), (1037, 21203), (1547, 14213), (1631, 13481), (3029, 7259), (3961, 5551)]