21645

素因数分解:

$3^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{37}}^1$

素因数の和:61

約数の個数: 24

約数和(自身を含む): 41496

約数和(自身を除く): 19851

約数列:

[1, 3, 5, 9, 13, 15, 37, 39, 45, 65, 111, 117, 185, 195, 333, 481, 555, 585, 1443, 1665, 2405, 4329, 7215, 21645]

約数ペア:

[(1, 21645), (3, 7215), (5, 4329), (9, 2405), (13, 1665), (15, 1443), (37, 585), (39, 555), (45, 481), (65, 333), (111, 195), (117, 185)]