21390921

素因数分解:

$3^2\times {\mathrm{37}}^1\times {\mathrm{64237}}^1$

素因数の和:64280

約数の個数: 12

約数和(自身を含む): 31733572

約数和(自身を除く): 10342651

約数列:

[1, 3, 9, 37, 111, 333, 64237, 192711, 578133, 2376769, 7130307, 21390921]

約数ペア:

[(1, 21390921), (3, 7130307), (9, 2376769), (37, 578133), (111, 192711), (333, 64237)]