399340

素因数分解:

$2^2\times 5^1\times {\mathrm{41}}^1\times {\mathrm{487}}^1$

素因数の和:537

約数の個数: 24

約数和(自身を含む): 860832

約数和(自身を除く): 461492

約数列:

[1, 2, 4, 5, 10, 20, 41, 82, 164, 205, 410, 487, 820, 974, 1948, 2435, 4870, 9740, 19967, 39934, 79868, 99835, 199670, 399340]

約数ペア:

[(1, 399340), (2, 199670), (4, 99835), (5, 79868), (10, 39934), (20, 19967), (41, 9740), (82, 4870), (164, 2435), (205, 1948), (410, 974), (487, 820)]