19809155

素因数分解:

$5^1\times {\mathrm{31}}^1\times {\mathrm{227}}^1\times {\mathrm{563}}^1$

素因数の和:826

約数の個数: 16

約数和(自身を含む): 24689664

約数和(自身を除く): 4880509

約数列:

[1, 5, 31, 155, 227, 563, 1135, 2815, 7037, 17453, 35185, 87265, 127801, 639005, 3961831, 19809155]

約数ペア:

[(1, 19809155), (5, 3961831), (31, 639005), (155, 127801), (227, 87265), (563, 35185), (1135, 17453), (2815, 7037)]