21120351

素因数分解:

$3^1\times 7^1\times {\mathrm{409}}^1\times {\mathrm{2459}}^1$

素因数の和:2878

約数の個数: 16

約数和(自身を含む): 32275200

約数和(自身を除く): 11154849

約数列:

[1, 3, 7, 21, 409, 1227, 2459, 2863, 7377, 8589, 17213, 51639, 1005731, 3017193, 7040117, 21120351]

約数ペア:

[(1, 21120351), (3, 7040117), (7, 3017193), (21, 1005731), (409, 51639), (1227, 17213), (2459, 8589), (2863, 7377)]