20981680

素因数分解:

$2^4\times 5^1\times {\mathrm{262271}}^1$

素因数の和:262284

約数の個数: 20

約数和(自身を含む): 48782592

約数和(自身を除く): 27800912

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 262271, 524542, 1049084, 1311355, 2098168, 2622710, 4196336, 5245420, 10490840, 20981680]

約数ペア:

[(1, 20981680), (2, 10490840), (4, 5245420), (5, 4196336), (8, 2622710), (10, 2098168), (16, 1311355), (20, 1049084), (40, 524542), (80, 262271)]