81440540

素因数分解:

$2^2\times 5^1\times {\mathrm{17}}^1\times {\mathrm{239531}}^1$

素因数の和:239557

約数の個数: 24

約数和(自身を含む): 181086192

約数和(自身を除く): 99645652

約数列:

[1, 2, 4, 5, 10, 17, 20, 34, 68, 85, 170, 340, 239531, 479062, 958124, 1197655, 2395310, 4072027, 4790620, 8144054, 16288108, 20360135, 40720270, 81440540]

約数ペア:

[(1, 81440540), (2, 40720270), (4, 20360135), (5, 16288108), (10, 8144054), (17, 4790620), (20, 4072027), (34, 2395310), (68, 1197655), (85, 958124), (170, 479062), (340, 239531)]