21971655

素因数分解:

$3^4\times 5^1\times {\mathrm{54251}}^1$

素因数の和:54268

約数の個数: 20

約数和(自身を含む): 39386952

約数和(自身を除く): 17415297

約数列:

[1, 3, 5, 9, 15, 27, 45, 81, 135, 405, 54251, 162753, 271255, 488259, 813765, 1464777, 2441295, 4394331, 7323885, 21971655]

約数ペア:

[(1, 21971655), (3, 7323885), (5, 4394331), (9, 2441295), (15, 1464777), (27, 813765), (45, 488259), (81, 271255), (135, 162753), (405, 54251)]