20404805

素因数分解:

$5^1\times {\mathrm{61}}^1\times {\mathrm{149}}^1\times {\mathrm{449}}^1$

素因数の和:664

約数の個数: 16

約数和(自身を含む): 25110000

約数和(自身を除く): 4705195

約数列:

[1, 5, 61, 149, 305, 449, 745, 2245, 9089, 27389, 45445, 66901, 136945, 334505, 4080961, 20404805]

約数ペア:

[(1, 20404805), (5, 4080961), (61, 334505), (149, 136945), (305, 66901), (449, 45445), (745, 27389), (2245, 9089)]