391240

素因数分解:

$2^3\times 5^1\times {\mathrm{9781}}^1$

素因数の和:9792

約数の個数: 16

約数和(自身を含む): 880380

約数和(自身を除く): 489140

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 9781, 19562, 39124, 48905, 78248, 97810, 195620, 391240]

約数ペア:

[(1, 391240), (2, 195620), (4, 97810), (5, 78248), (8, 48905), (10, 39124), (20, 19562), (40, 9781)]