21780945

素因数分解:

$3^2\times 5^1\times {\mathrm{137}}^1\times {\mathrm{3533}}^1$

素因数の和:3681

約数の個数: 24

約数和(自身を含む): 38039976

約数和(自身を除く): 16259031

約数列:

[1, 3, 5, 9, 15, 45, 137, 411, 685, 1233, 2055, 3533, 6165, 10599, 17665, 31797, 52995, 158985, 484021, 1452063, 2420105, 4356189, 7260315, 21780945]

約数ペア:

[(1, 21780945), (3, 7260315), (5, 4356189), (9, 2420105), (15, 1452063), (45, 484021), (137, 158985), (411, 52995), (685, 31797), (1233, 17665), (2055, 10599), (3533, 6165)]