81542140

素因数分解:

$2^2\times 5^1\times {\mathrm{1289}}^1\times {\mathrm{3163}}^1$

素因数の和:4461

約数の個数: 24

約数和(自身を含む): 171425520

約数和(自身を除く): 89883380

約数列:

[1, 2, 4, 5, 10, 20, 1289, 2578, 3163, 5156, 6326, 6445, 12652, 12890, 15815, 25780, 31630, 63260, 4077107, 8154214, 16308428, 20385535, 40771070, 81542140]

約数ペア:

[(1, 81542140), (2, 40771070), (4, 20385535), (5, 16308428), (10, 8154214), (20, 4077107), (1289, 63260), (2578, 31630), (3163, 25780), (5156, 15815), (6326, 12890), (6445, 12652)]