21991081

素因数分解:

$7^1\times {\mathrm{17}}^1\times {\mathrm{283}}^1\times {\mathrm{653}}^1$

素因数の和:960

約数の個数: 16

約数和(自身を含む): 26745984

約数和(自身を除く): 4754903

約数列:

[1, 7, 17, 119, 283, 653, 1981, 4571, 4811, 11101, 33677, 77707, 184799, 1293593, 3141583, 21991081]

約数ペア:

[(1, 21991081), (7, 3141583), (17, 1293593), (119, 184799), (283, 77707), (653, 33677), (1981, 11101), (4571, 4811)]