21390981

素因数分解:

$3^1\times {\mathrm{17}}^1\times {\mathrm{59}}^1\times {\mathrm{7109}}^1$

素因数の和:7188

約数の個数: 16

約数和(自身を含む): 30715200

約数和(自身を除く): 9324219

約数列:

[1, 3, 17, 51, 59, 177, 1003, 3009, 7109, 21327, 120853, 362559, 419431, 1258293, 7130327, 21390981]

約数ペア:

[(1, 21390981), (3, 7130327), (17, 1258293), (51, 419431), (59, 362559), (177, 120853), (1003, 21327), (3009, 7109)]