21161855

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{1741}}^1$

素因数の和:1787

約数の個数: 32

約数和(自身を含む): 31606848

約数和(自身を除く): 10444993

約数列:

[1, 5, 11, 13, 17, 55, 65, 85, 143, 187, 221, 715, 935, 1105, 1741, 2431, 8705, 12155, 19151, 22633, 29597, 95755, 113165, 147985, 248963, 325567, 384761, 1244815, 1627835, 1923805, 4232371, 21161855]

約数ペア:

[(1, 21161855), (5, 4232371), (11, 1923805), (13, 1627835), (17, 1244815), (55, 384761), (65, 325567), (85, 248963), (143, 147985), (187, 113165), (221, 95755), (715, 29597), (935, 22633), (1105, 19151), (1741, 12155), (2431, 8705)]