21990316

素因数分解:

$2^2\times {\mathrm{17}}^1\times {\mathrm{331}}^1\times {\mathrm{977}}^1$

素因数の和:1329

約数の個数: 24

約数和(自身を含む): 40911696

約数和(自身を除く): 18921380

約数列:

[1, 2, 4, 17, 34, 68, 331, 662, 977, 1324, 1954, 3908, 5627, 11254, 16609, 22508, 33218, 66436, 323387, 646774, 1293548, 5497579, 10995158, 21990316]

約数ペア:

[(1, 21990316), (2, 10995158), (4, 5497579), (17, 1293548), (34, 646774), (68, 323387), (331, 66436), (662, 33218), (977, 22508), (1324, 16609), (1954, 11254), (3908, 5627)]