18891985

素因数分解:

$5^1\times 7^1\times {\mathrm{19}}^1\times {\mathrm{28409}}^1$

素因数の和:28440

約数の個数: 16

約数和(自身を含む): 27273600

約数和(自身を除く): 8381615

約数列:

[1, 5, 7, 19, 35, 95, 133, 665, 28409, 142045, 198863, 539771, 994315, 2698855, 3778397, 18891985]

約数ペア:

[(1, 18891985), (5, 3778397), (7, 2698855), (19, 994315), (35, 539771), (95, 198863), (133, 142045), (665, 28409)]