645340

素因数分解:

$2^2\times 5^1\times {\mathrm{41}}^1\times {\mathrm{787}}^1$

素因数の和:837

約数の個数: 24

約数和(自身を含む): 1390032

約数和(自身を除く): 744692

約数列:

[1, 2, 4, 5, 10, 20, 41, 82, 164, 205, 410, 787, 820, 1574, 3148, 3935, 7870, 15740, 32267, 64534, 129068, 161335, 322670, 645340]

約数ペア:

[(1, 645340), (2, 322670), (4, 161335), (5, 129068), (10, 64534), (20, 32267), (41, 15740), (82, 7870), (164, 3935), (205, 3148), (410, 1574), (787, 820)]