21721749

素因数分解:

$3^1\times 7^2\times {\mathrm{107}}^1\times {\mathrm{1381}}^1$

素因数の和:1505

約数の個数: 24

約数和(自身を含む): 34030368

約数和(自身を除く): 12308619

約数列:

[1, 3, 7, 21, 49, 107, 147, 321, 749, 1381, 2247, 4143, 5243, 9667, 15729, 29001, 67669, 147767, 203007, 443301, 1034369, 3103107, 7240583, 21721749]

約数ペア:

[(1, 21721749), (3, 7240583), (7, 3103107), (21, 1034369), (49, 443301), (107, 203007), (147, 147767), (321, 67669), (749, 29001), (1381, 15729), (2247, 9667), (4143, 5243)]