21381.000000

素因数分解:

$2^1\times {\mathrm{17}}^1\times {\mathrm{71}}^1\times {\mathrm{89}}^1$

素因数の和:179

約数の個数: 16

約数和(自身を含む): 349920

約数和(自身を除く): 135074

約数列:

[1, 2, 17, 34, 71, 89, 142, 178, 1207, 1513, 2414, 3026, 6319, 12638, 107423, 214846]

約数ペア:

[(1, 214846), (2, 107423), (17, 12638), (34, 6319), (71, 3026), (89, 2414), (142, 1513), (178, 1207)]