18877790

素因数分解:

$2^1\times 5^1\times {\mathrm{89}}^1\times {\mathrm{21211}}^1$

素因数の和:21307

約数の個数: 16

約数和(自身を含む): 34363440

約数和(自身を除く): 15485650

約数列:

[1, 2, 5, 10, 89, 178, 445, 890, 21211, 42422, 106055, 212110, 1887779, 3775558, 9438895, 18877790]

約数ペア:

[(1, 18877790), (2, 9438895), (5, 3775558), (10, 1887779), (89, 212110), (178, 106055), (445, 42422), (890, 21211)]