639679540

素因数分解:

$2^2\times 5^1\times {\mathrm{41}}^1\times {\mathrm{641}}^1\times {\mathrm{1217}}^1$

素因数の和:1908

約数の個数: 48

約数和(自身を含む): 1379370384

約数和(自身を除く): 739690844

約数列:

[1, 2, 4, 5, 10, 20, 41, 82, 164, 205, 410, 641, 820, 1217, 1282, 2434, 2564, 3205, 4868, 6085, 6410, 12170, 12820, 24340, 26281, 49897, 52562, 99794, 105124, 131405, 199588, 249485, 262810, 498970, 525620, 780097, 997940, 1560194, 3120388, 3900485, 7800970, 15601940, 31983977, 63967954, 127935908, 159919885, 319839770, 639679540]

約数ペア:

[(1, 639679540), (2, 319839770), (4, 159919885), (5, 127935908), (10, 63967954), (20, 31983977), (41, 15601940), (82, 7800970), (164, 3900485), (205, 3120388), (410, 1560194), (641, 997940), (820, 780097), (1217, 525620), (1282, 498970), (2434, 262810), (2564, 249485), (3205, 199588), (4868, 131405), (6085, 105124), (6410, 99794), (12170, 52562), (12820, 49897), (24340, 26281)]