20921815

素因数分解:

$5^1\times {\mathrm{17}}^1\times {\mathrm{47}}^1\times {\mathrm{5237}}^1$

素因数の和:5306

約数の個数: 16

約数和(自身を含む): 27153792

約数和(自身を除く): 6231977

約数列:

[1, 5, 17, 47, 85, 235, 799, 3995, 5237, 26185, 89029, 246139, 445145, 1230695, 4184363, 20921815]

約数ペア:

[(1, 20921815), (5, 4184363), (17, 1230695), (47, 445145), (85, 246139), (235, 89029), (799, 26185), (3995, 5237)]