219980

素因数分解:

$2^2\times 5^1\times {\mathrm{17}}^1\times {\mathrm{647}}^1$

素因数の和:673

約数の個数: 24

約数和(自身を含む): 489888

約数和(自身を除く): 269908

約数列:

[1, 2, 4, 5, 10, 17, 20, 34, 68, 85, 170, 340, 647, 1294, 2588, 3235, 6470, 10999, 12940, 21998, 43996, 54995, 109990, 219980]

約数ペア:

[(1, 219980), (2, 109990), (4, 54995), (5, 43996), (10, 21998), (17, 12940), (20, 10999), (34, 6470), (68, 3235), (85, 2588), (170, 1294), (340, 647)]