21990124

素因数分解:

$2^2\times {\mathrm{13}}^1\times {\mathrm{53}}^1\times {\mathrm{79}}^1\times {\mathrm{101}}^1$

素因数の和:250

約数の個数: 48

約数和(自身を含む): 43182720

約数和(自身を除く): 21192596

約数列:

[1, 2, 4, 13, 26, 52, 53, 79, 101, 106, 158, 202, 212, 316, 404, 689, 1027, 1313, 1378, 2054, 2626, 2756, 4108, 4187, 5252, 5353, 7979, 8374, 10706, 15958, 16748, 21412, 31916, 54431, 69589, 103727, 108862, 139178, 207454, 217724, 278356, 414908, 422887, 845774, 1691548, 5497531, 10995062, 21990124]

約数ペア:

[(1, 21990124), (2, 10995062), (4, 5497531), (13, 1691548), (26, 845774), (52, 422887), (53, 414908), (79, 278356), (101, 217724), (106, 207454), (158, 139178), (202, 108862), (212, 103727), (316, 69589), (404, 54431), (689, 31916), (1027, 21412), (1313, 16748), (1378, 15958), (2054, 10706), (2626, 8374), (2756, 7979), (4108, 5353), (4187, 5252)]