20990865

素因数分解:

$3^1\times 5^1\times 7^2\times {\mathrm{28559}}^1$

素因数の和:28581

約数の個数: 24

約数和(自身を含む): 39070080

約数和(自身を除く): 18079215

約数列:

[1, 3, 5, 7, 15, 21, 35, 49, 105, 147, 245, 735, 28559, 85677, 142795, 199913, 428385, 599739, 999565, 1399391, 2998695, 4198173, 6996955, 20990865]

約数ペア:

[(1, 20990865), (3, 6996955), (5, 4198173), (7, 2998695), (15, 1399391), (21, 999565), (35, 599739), (49, 428385), (105, 199913), (147, 142795), (245, 85677), (735, 28559)]