21355389

素因数分解:

$3^2\times {\mathrm{11}}^1\times {\mathrm{109}}^1\times {\mathrm{1979}}^1$

素因数の和:2105

約数の個数: 24

約数和(自身を含む): 33976800

約数和(自身を除く): 12621411

約数列:

[1, 3, 9, 11, 33, 99, 109, 327, 981, 1199, 1979, 3597, 5937, 10791, 17811, 21769, 65307, 195921, 215711, 647133, 1941399, 2372821, 7118463, 21355389]

約数ペア:

[(1, 21355389), (3, 7118463), (9, 2372821), (11, 1941399), (33, 647133), (99, 215711), (109, 195921), (327, 65307), (981, 21769), (1199, 17811), (1979, 10791), (3597, 5937)]