65781220

素因数分解:

$2^2\times 5^1\times {\mathrm{41}}^1\times {\mathrm{80221}}^1$

素因数の和:80271

約数の個数: 24

約数和(自身を含む): 141511608

約数和(自身を除く): 75730388

約数列:

[1, 2, 4, 5, 10, 20, 41, 82, 164, 205, 410, 820, 80221, 160442, 320884, 401105, 802210, 1604420, 3289061, 6578122, 13156244, 16445305, 32890610, 65781220]

約数ペア:

[(1, 65781220), (2, 32890610), (4, 16445305), (5, 13156244), (10, 6578122), (20, 3289061), (41, 1604420), (82, 802210), (164, 401105), (205, 320884), (410, 160442), (820, 80221)]