20511925

素因数分解:

$5^2\times 7^1\times {\mathrm{19}}^1\times {\mathrm{31}}^1\times {\mathrm{199}}^1$

素因数の和:266

約数の個数: 48

約数和(自身を含む): 31744000

約数和(自身を除く): 11232075

約数列:

[1, 5, 7, 19, 25, 31, 35, 95, 133, 155, 175, 199, 217, 475, 589, 665, 775, 995, 1085, 1393, 2945, 3325, 3781, 4123, 4975, 5425, 6169, 6965, 14725, 18905, 20615, 26467, 30845, 34825, 43183, 94525, 103075, 117211, 132335, 154225, 215915, 586055, 661675, 820477, 1079575, 2930275, 4102385, 20511925]

約数ペア:

[(1, 20511925), (5, 4102385), (7, 2930275), (19, 1079575), (25, 820477), (31, 661675), (35, 586055), (95, 215915), (133, 154225), (155, 132335), (175, 117211), (199, 103075), (217, 94525), (475, 43183), (589, 34825), (665, 30845), (775, 26467), (995, 20615), (1085, 18905), (1393, 14725), (2945, 6965), (3325, 6169), (3781, 5425), (4123, 4975)]