21789257

素因数分解:

$7^1\times {\mathrm{17}}^1\times {\mathrm{19}}^1\times {\mathrm{23}}^1\times {\mathrm{419}}^1$

素因数の和:485

約数の個数: 32

約数和(自身を含む): 29030400

約数和(自身を除く): 7241143

約数列:

[1, 7, 17, 19, 23, 119, 133, 161, 323, 391, 419, 437, 2261, 2737, 2933, 3059, 7123, 7429, 7961, 9637, 49861, 52003, 55727, 67459, 135337, 163829, 183103, 947359, 1146803, 1281721, 3112751, 21789257]

約数ペア:

[(1, 21789257), (7, 3112751), (17, 1281721), (19, 1146803), (23, 947359), (119, 183103), (133, 163829), (161, 135337), (323, 67459), (391, 55727), (419, 52003), (437, 49861), (2261, 9637), (2737, 7961), (2933, 7429), (3059, 7123)]