686379740

素因数分解:

$2^2\times 5^1\times {\mathrm{131}}^1\times {\mathrm{261977}}^1$

素因数の和:262117

約数の個数: 24

約数和(自身を含む): 1452406032

約数和(自身を除く): 766026292

約数列:

[1, 2, 4, 5, 10, 20, 131, 262, 524, 655, 1310, 2620, 261977, 523954, 1047908, 1309885, 2619770, 5239540, 34318987, 68637974, 137275948, 171594935, 343189870, 686379740]

約数ペア:

[(1, 686379740), (2, 343189870), (4, 171594935), (5, 137275948), (10, 68637974), (20, 34318987), (131, 5239540), (262, 2619770), (524, 1309885), (655, 1047908), (1310, 523954), (2620, 261977)]