21091609

素因数分解:

$7^2\times {\mathrm{11}}^1\times {\mathrm{109}}^1\times {\mathrm{359}}^1$

素因数の和:493

約数の個数: 24

約数和(自身を含む): 27086400

約数和(自身を除く): 5994791

約数列:

[1, 7, 11, 49, 77, 109, 359, 539, 763, 1199, 2513, 3949, 5341, 8393, 17591, 27643, 39131, 58751, 193501, 273917, 430441, 1917419, 3013087, 21091609]

約数ペア:

[(1, 21091609), (7, 3013087), (11, 1917419), (49, 430441), (77, 273917), (109, 193501), (359, 58751), (539, 39131), (763, 27643), (1199, 17591), (2513, 8393), (3949, 5341)]