639999

素因数分解:

$3^2\times {\mathrm{17}}^1\times {\mathrm{47}}^1\times {\mathrm{89}}^1$

素因数の和:159

約数の個数: 24

約数和(自身を含む): 1010880

約数和(自身を除く): 370881

約数列:

[1, 3, 9, 17, 47, 51, 89, 141, 153, 267, 423, 799, 801, 1513, 2397, 4183, 4539, 7191, 12549, 13617, 37647, 71111, 213333, 639999]

約数ペア:

[(1, 639999), (3, 213333), (9, 71111), (17, 37647), (47, 13617), (51, 12549), (89, 7191), (141, 4539), (153, 4183), (267, 2397), (423, 1513), (799, 801)]