21385805

素因数分解:

$5^1\times 7^2\times {\mathrm{41}}^1\times {\mathrm{2129}}^1$

素因数の和:2189

約数の個数: 24

約数和(自身を含む): 30595320

約数和(自身を除く): 9209515

約数列:

[1, 5, 7, 35, 41, 49, 205, 245, 287, 1435, 2009, 2129, 10045, 10645, 14903, 74515, 87289, 104321, 436445, 521605, 611023, 3055115, 4277161, 21385805]

約数ペア:

[(1, 21385805), (5, 4277161), (7, 3055115), (35, 611023), (41, 521605), (49, 436445), (205, 104321), (245, 87289), (287, 74515), (1435, 14903), (2009, 10645), (2129, 10045)]