21208481

素因数分解:

$7^1\times {\mathrm{71}}^1\times {\mathrm{139}}^1\times {\mathrm{307}}^1$

素因数の和:524

約数の個数: 16

約数和(自身を含む): 24837120

約数和(自身を除く): 3628639

約数列:

[1, 7, 71, 139, 307, 497, 973, 2149, 9869, 21797, 42673, 69083, 152579, 298711, 3029783, 21208481]

約数ペア:

[(1, 21208481), (7, 3029783), (71, 298711), (139, 152579), (307, 69083), (497, 42673), (973, 21797), (2149, 9869)]