21396860

素因数分解:

$2^2\times 5^1\times {\mathrm{439}}^1\times {\mathrm{2437}}^1$

素因数の和:2885

約数の個数: 24

約数和(自身を含む): 45054240

約数和(自身を除く): 23657380

約数列:

[1, 2, 4, 5, 10, 20, 439, 878, 1756, 2195, 2437, 4390, 4874, 8780, 9748, 12185, 24370, 48740, 1069843, 2139686, 4279372, 5349215, 10698430, 21396860]

約数ペア:

[(1, 21396860), (2, 10698430), (4, 5349215), (5, 4279372), (10, 2139686), (20, 1069843), (439, 48740), (878, 24370), (1756, 12185), (2195, 9748), (2437, 8780), (4390, 4874)]