21280719

素因数分解:

$3^1\times {\mathrm{17}}^1\times {\mathrm{53}}^1\times {\mathrm{7873}}^1$

素因数の和:7946

約数の個数: 16

約数和(自身を含む): 30614112

約数和(自身を除く): 9333393

約数列:

[1, 3, 17, 51, 53, 159, 901, 2703, 7873, 23619, 133841, 401523, 417269, 1251807, 7093573, 21280719]

約数ペア:

[(1, 21280719), (3, 7093573), (17, 1251807), (51, 417269), (53, 401523), (159, 133841), (901, 23619), (2703, 7873)]