21145019

素因数分解:

$7^2\times {\mathrm{37}}^1\times {\mathrm{107}}^1\times {\mathrm{109}}^1$

素因数の和:267

約数の個数: 24

約数和(自身を含む): 25732080

約数和(自身を除く): 4587061

約数列:

[1, 7, 37, 49, 107, 109, 259, 749, 763, 1813, 3959, 4033, 5243, 5341, 11663, 27713, 28231, 81641, 193991, 197617, 431531, 571487, 3020717, 21145019]

約数ペア:

[(1, 21145019), (7, 3020717), (37, 571487), (49, 431531), (107, 197617), (109, 193991), (259, 81641), (749, 28231), (763, 27713), (1813, 11663), (3959, 5341), (4033, 5243)]