21302787

素因数分解:

$3^1\times {\mathrm{11}}^1\times {\mathrm{37}}^1\times {\mathrm{73}}^1\times {\mathrm{239}}^1$

素因数の和:363

約数の個数: 32

約数和(自身を含む): 32394240

約数和(自身を除く): 11091453

約数列:

[1, 3, 11, 33, 37, 73, 111, 219, 239, 407, 717, 803, 1221, 2409, 2629, 2701, 7887, 8103, 8843, 17447, 26529, 29711, 52341, 89133, 97273, 191917, 291819, 575751, 645539, 1936617, 7100929, 21302787]

約数ペア:

[(1, 21302787), (3, 7100929), (11, 1936617), (33, 645539), (37, 575751), (73, 291819), (111, 191917), (219, 97273), (239, 89133), (407, 52341), (717, 29711), (803, 26529), (1221, 17447), (2409, 8843), (2629, 8103), (2701, 7887)]