21480865

素因数分解:

$5^1\times 7^2\times {\mathrm{43}}^1\times {\mathrm{2039}}^1$

素因数の和:2101

約数の個数: 24

約数和(自身を含む): 30697920

約数和(自身を除く): 9217055

約数列:

[1, 5, 7, 35, 43, 49, 215, 245, 301, 1505, 2039, 2107, 10195, 10535, 14273, 71365, 87677, 99911, 438385, 499555, 613739, 3068695, 4296173, 21480865]

約数ペア:

[(1, 21480865), (5, 4296173), (7, 3068695), (35, 613739), (43, 499555), (49, 438385), (215, 99911), (245, 87677), (301, 71365), (1505, 14273), (2039, 10535), (2107, 10195)]