21806908

素因数分解:

$2^2\times {\mathrm{19}}^1\times {\mathrm{263}}^1\times {\mathrm{1091}}^1$

素因数の和:1377

約数の個数: 24

約数和(自身を含む): 40360320

約数和(自身を除く): 18553412

約数列:

[1, 2, 4, 19, 38, 76, 263, 526, 1052, 1091, 2182, 4364, 4997, 9994, 19988, 20729, 41458, 82916, 286933, 573866, 1147732, 5451727, 10903454, 21806908]

約数ペア:

[(1, 21806908), (2, 10903454), (4, 5451727), (19, 1147732), (38, 573866), (76, 286933), (263, 82916), (526, 41458), (1052, 20729), (1091, 19988), (2182, 9994), (4364, 4997)]