21919415

素因数分解:

$5^1\times 7^3\times {\mathrm{12781}}^1$

素因数の和:12807

約数の個数: 16

約数和(自身を含む): 30676800

約数和(自身を除く): 8757385

約数列:

[1, 5, 7, 35, 49, 245, 343, 1715, 12781, 63905, 89467, 447335, 626269, 3131345, 4383883, 21919415]

約数ペア:

[(1, 21919415), (5, 4383883), (7, 3131345), (35, 626269), (49, 447335), (245, 89467), (343, 63905), (1715, 12781)]