21245913

素因数分解:

$3^2\times {\mathrm{13}}^1\times {\mathrm{41}}^1\times {\mathrm{43}}^1\times {\mathrm{103}}^1$

素因数の和:206

約数の個数: 48

約数和(自身を含む): 34978944

約数和(自身を除く): 13733031

約数列:

[1, 3, 9, 13, 39, 41, 43, 103, 117, 123, 129, 309, 369, 387, 533, 559, 927, 1339, 1599, 1677, 1763, 4017, 4223, 4429, 4797, 5031, 5289, 12051, 12669, 13287, 15867, 22919, 38007, 39861, 54899, 57577, 68757, 164697, 172731, 181589, 206271, 494091, 518193, 544767, 1634301, 2360657, 7081971, 21245913]

約数ペア:

[(1, 21245913), (3, 7081971), (9, 2360657), (13, 1634301), (39, 544767), (41, 518193), (43, 494091), (103, 206271), (117, 181589), (123, 172731), (129, 164697), (309, 68757), (369, 57577), (387, 54899), (533, 39861), (559, 38007), (927, 22919), (1339, 15867), (1599, 13287), (1677, 12669), (1763, 12051), (4017, 5289), (4223, 5031), (4429, 4797)]