388996881

素因数分解:

$3^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{907}}^1\times {\mathrm{1571}}^1$

素因数の和:2501

約数の個数: 32

約数和(自身を含む): 639464448

約数和(自身を除く): 250467567

約数列:

[1, 3, 7, 13, 21, 39, 91, 273, 907, 1571, 2721, 4713, 6349, 10997, 11791, 19047, 20423, 32991, 35373, 61269, 82537, 142961, 247611, 428883, 1424897, 4274691, 9974279, 18523661, 29922837, 55570983, 129665627, 388996881]

約数ペア:

[(1, 388996881), (3, 129665627), (7, 55570983), (13, 29922837), (21, 18523661), (39, 9974279), (91, 4274691), (273, 1424897), (907, 428883), (1571, 247611), (2721, 142961), (4713, 82537), (6349, 61269), (10997, 35373), (11791, 32991), (19047, 20423)]