20640645

素因数分解:

$3^2\times 5^1\times {\mathrm{43}}^1\times {\mathrm{10667}}^1$

素因数の和:10721

約数の個数: 24

約数和(自身を含む): 36612576

約数和(自身を除く): 15971931

約数列:

[1, 3, 5, 9, 15, 43, 45, 129, 215, 387, 645, 1935, 10667, 32001, 53335, 96003, 160005, 458681, 480015, 1376043, 2293405, 4128129, 6880215, 20640645]

約数ペア:

[(1, 20640645), (3, 6880215), (5, 4128129), (9, 2293405), (15, 1376043), (43, 480015), (45, 458681), (129, 160005), (215, 96003), (387, 53335), (645, 32001), (1935, 10667)]