640205675

素因数分解:

$5^2\times {\mathrm{61}}^1\times {\mathrm{197}}^1\times {\mathrm{2131}}^1$

素因数の和:2399

約数の個数: 24

約数和(自身を含む): 811345392

約数和(自身を除く): 171139717

約数列:

[1, 5, 25, 61, 197, 305, 985, 1525, 2131, 4925, 10655, 12017, 53275, 60085, 129991, 300425, 419807, 649955, 2099035, 3249775, 10495175, 25608227, 128041135, 640205675]

約数ペア:

[(1, 640205675), (5, 128041135), (25, 25608227), (61, 10495175), (197, 3249775), (305, 2099035), (985, 649955), (1525, 419807), (2131, 300425), (4925, 129991), (10655, 60085), (12017, 53275)]