21049587

素因数分解:

$3^2\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{19}}^1\times {\mathrm{557}}^1$

素因数の和:612

約数の個数: 48

約数和(自身を含む): 36560160

約数和(自身を除く): 15510573

約数列:

[1, 3, 9, 13, 17, 19, 39, 51, 57, 117, 153, 171, 221, 247, 323, 557, 663, 741, 969, 1671, 1989, 2223, 2907, 4199, 5013, 7241, 9469, 10583, 12597, 21723, 28407, 31749, 37791, 65169, 85221, 95247, 123097, 137579, 179911, 369291, 412737, 539733, 1107873, 1238211, 1619199, 2338843, 7016529, 21049587]

約数ペア:

[(1, 21049587), (3, 7016529), (9, 2338843), (13, 1619199), (17, 1238211), (19, 1107873), (39, 539733), (51, 412737), (57, 369291), (117, 179911), (153, 137579), (171, 123097), (221, 95247), (247, 85221), (323, 65169), (557, 37791), (663, 31749), (741, 28407), (969, 21723), (1671, 12597), (1989, 10583), (2223, 9469), (2907, 7241), (4199, 5013)]