19778775

素因数分解:

$3^1\times 5^2\times {\mathrm{31}}^1\times {\mathrm{47}}^1\times {\mathrm{181}}^1$

素因数の和:272

約数の個数: 48

約数和(自身を含む): 34664448

約数和(自身を除く): 14885673

約数列:

[1, 3, 5, 15, 25, 31, 47, 75, 93, 141, 155, 181, 235, 465, 543, 705, 775, 905, 1175, 1457, 2325, 2715, 3525, 4371, 4525, 5611, 7285, 8507, 13575, 16833, 21855, 25521, 28055, 36425, 42535, 84165, 109275, 127605, 140275, 212675, 263717, 420825, 638025, 791151, 1318585, 3955755, 6592925, 19778775]

約数ペア:

[(1, 19778775), (3, 6592925), (5, 3955755), (15, 1318585), (25, 791151), (31, 638025), (47, 420825), (75, 263717), (93, 212675), (141, 140275), (155, 127605), (181, 109275), (235, 84165), (465, 42535), (543, 36425), (705, 28055), (775, 25521), (905, 21855), (1175, 16833), (1457, 13575), (2325, 8507), (2715, 7285), (3525, 5611), (4371, 4525)]