20821965

素因数分解:

$3^1\times 5^1\times {\mathrm{103}}^1\times {\mathrm{13477}}^1$

素因数の和:13588

約数の個数: 16

約数和(自身を含む): 33641088

約数和(自身を除く): 12819123

約数列:

[1, 3, 5, 15, 103, 309, 515, 1545, 13477, 40431, 67385, 202155, 1388131, 4164393, 6940655, 20821965]

約数ペア:

[(1, 20821965), (3, 6940655), (5, 4164393), (15, 1388131), (103, 202155), (309, 67385), (515, 40431), (1545, 13477)]