21015501

素因数分解:

$3^1\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{79}}^1\times {\mathrm{359}}^1$

素因数の和:473

約数の個数: 32

約数和(自身を含む): 32256000

約数和(自身を除く): 11240499

約数列:

[1, 3, 13, 19, 39, 57, 79, 237, 247, 359, 741, 1027, 1077, 1501, 3081, 4503, 4667, 6821, 14001, 19513, 20463, 28361, 58539, 85083, 88673, 266019, 368693, 538859, 1106079, 1616577, 7005167, 21015501]

約数ペア:

[(1, 21015501), (3, 7005167), (13, 1616577), (19, 1106079), (39, 538859), (57, 368693), (79, 266019), (237, 88673), (247, 85083), (359, 58539), (741, 28361), (1027, 20463), (1077, 19513), (1501, 14001), (3081, 6821), (4503, 4667)]