21981765

素因数分解:

$3^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{19}}^1\times {\mathrm{349}}^1$

素因数の和:406

約数の個数: 64

約数和(自身を含む): 42336000

約数和(自身を除く): 20354235

約数列:

[1, 3, 5, 13, 15, 17, 19, 39, 51, 57, 65, 85, 95, 195, 221, 247, 255, 285, 323, 349, 663, 741, 969, 1047, 1105, 1235, 1615, 1745, 3315, 3705, 4199, 4537, 4845, 5235, 5933, 6631, 12597, 13611, 17799, 19893, 20995, 22685, 29665, 33155, 62985, 68055, 77129, 86203, 88995, 99465, 112727, 231387, 258609, 338181, 385645, 431015, 563635, 1156935, 1293045, 1465451, 1690905, 4396353, 7327255, 21981765]

約数ペア:

[(1, 21981765), (3, 7327255), (5, 4396353), (13, 1690905), (15, 1465451), (17, 1293045), (19, 1156935), (39, 563635), (51, 431015), (57, 385645), (65, 338181), (85, 258609), (95, 231387), (195, 112727), (221, 99465), (247, 88995), (255, 86203), (285, 77129), (323, 68055), (349, 62985), (663, 33155), (741, 29665), (969, 22685), (1047, 20995), (1105, 19893), (1235, 17799), (1615, 13611), (1745, 12597), (3315, 6631), (3705, 5933), (4199, 5235), (4537, 4845)]