21997129

素因数分解:

$7^2\times {\mathrm{11}}^1\times {\mathrm{37}}^1\times {\mathrm{1103}}^1$

素因数の和:1165

約数の個数: 24

約数和(自身を含む): 28695168

約数和(自身を除く): 6698039

約数列:

[1, 7, 11, 37, 49, 77, 259, 407, 539, 1103, 1813, 2849, 7721, 12133, 19943, 40811, 54047, 84931, 285677, 448921, 594517, 1999739, 3142447, 21997129]

約数ペア:

[(1, 21997129), (7, 3142447), (11, 1999739), (37, 594517), (49, 448921), (77, 285677), (259, 84931), (407, 54047), (539, 40811), (1103, 19943), (1813, 12133), (2849, 7721)]