21128825

素因数分解:

$5^2\times {\mathrm{31}}^1\times {\mathrm{137}}^1\times {\mathrm{199}}^1$

素因数の和:377

約数の個数: 24

約数和(自身を含む): 27379200

約数和(自身を除く): 6250375

約数列:

[1, 5, 25, 31, 137, 155, 199, 685, 775, 995, 3425, 4247, 4975, 6169, 21235, 27263, 30845, 106175, 136315, 154225, 681575, 845153, 4225765, 21128825]

約数ペア:

[(1, 21128825), (5, 4225765), (25, 845153), (31, 681575), (137, 154225), (155, 136315), (199, 106175), (685, 30845), (775, 27263), (995, 21235), (3425, 6169), (4247, 4975)]