20997945

素因数分解:

$3^2\times 5^1\times {\mathrm{19}}^1\times {\mathrm{41}}^1\times {\mathrm{599}}^1$

素因数の和:670

約数の個数: 48

約数和(自身を含む): 39312000

約数和(自身を除く): 18314055

約数列:

[1, 3, 5, 9, 15, 19, 41, 45, 57, 95, 123, 171, 205, 285, 369, 599, 615, 779, 855, 1797, 1845, 2337, 2995, 3895, 5391, 7011, 8985, 11381, 11685, 24559, 26955, 34143, 35055, 56905, 73677, 102429, 122795, 170715, 221031, 368385, 466621, 512145, 1105155, 1399863, 2333105, 4199589, 6999315, 20997945]

約数ペア:

[(1, 20997945), (3, 6999315), (5, 4199589), (9, 2333105), (15, 1399863), (19, 1105155), (41, 512145), (45, 466621), (57, 368385), (95, 221031), (123, 170715), (171, 122795), (205, 102429), (285, 73677), (369, 56905), (599, 35055), (615, 34143), (779, 26955), (855, 24559), (1797, 11685), (1845, 11381), (2337, 8985), (2995, 7011), (3895, 5391)]