639171909

素因数分解:

$3^2\times {\mathrm{23}}^1\times {\mathrm{43}}^1\times {\mathrm{71809}}^1$

素因数の和:71881

約数の個数: 24

約数和(自身を含む): 985807680

約数和(自身を除く): 346635771

約数列:

[1, 3, 9, 23, 43, 69, 129, 207, 387, 989, 2967, 8901, 71809, 215427, 646281, 1651607, 3087787, 4954821, 9263361, 14864463, 27790083, 71019101, 213057303, 639171909]

約数ペア:

[(1, 639171909), (3, 213057303), (9, 71019101), (23, 27790083), (43, 14864463), (69, 9263361), (129, 4954821), (207, 3087787), (387, 1651607), (989, 646281), (2967, 215427), (8901, 71809)]