20000721

素因数分解:

$3^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{97}}^1\times {\mathrm{311}}^1$

素因数の和:441

約数の個数: 32

約数和(自身を含む): 30820608

約数和(自身を除く): 10819887

約数列:

[1, 3, 13, 17, 39, 51, 97, 221, 291, 311, 663, 933, 1261, 1649, 3783, 4043, 4947, 5287, 12129, 15861, 21437, 30167, 64311, 68731, 90501, 206193, 392171, 512839, 1176513, 1538517, 6666907, 20000721]

約数ペア:

[(1, 20000721), (3, 6666907), (13, 1538517), (17, 1176513), (39, 512839), (51, 392171), (97, 206193), (221, 90501), (291, 68731), (311, 64311), (663, 30167), (933, 21437), (1261, 15861), (1649, 12129), (3783, 5287), (4043, 4947)]