21187257

素因数分解:

$3^1\times 7^2\times {\mathrm{13}}^1\times {\mathrm{11087}}^1$

素因数の和:11117

約数の個数: 24

約数和(自身を含む): 35392896

約数和(自身を除く): 14205639

約数列:

[1, 3, 7, 13, 21, 39, 49, 91, 147, 273, 637, 1911, 11087, 33261, 77609, 144131, 232827, 432393, 543263, 1008917, 1629789, 3026751, 7062419, 21187257]

約数ペア:

[(1, 21187257), (3, 7062419), (7, 3026751), (13, 1629789), (21, 1008917), (39, 543263), (49, 432393), (91, 232827), (147, 144131), (273, 77609), (637, 33261), (1911, 11087)]