28405209

素因数分解:

$3^1\times 7^1\times {\mathrm{19}}^1\times {\mathrm{71191}}^1$

素因数の和:71220

約数の個数: 16

約数和(自身を含む): 45562880

約数和(自身を除く): 17157671

約数列:

[1, 3, 7, 19, 21, 57, 133, 399, 71191, 213573, 498337, 1352629, 1495011, 4057887, 9468403, 28405209]

約数ペア:

[(1, 28405209), (3, 9468403), (7, 4057887), (19, 1495011), (21, 1352629), (57, 498337), (133, 213573), (399, 71191)]