21131439

素因数分解:

$3^1\times 7^1\times {\mathrm{19}}^1\times {\mathrm{211}}^1\times {\mathrm{251}}^1$

素因数の和:491

約数の個数: 32

約数和(自身を含む): 34191360

約数和(自身を除く): 13059921

約数列:

[1, 3, 7, 19, 21, 57, 133, 211, 251, 399, 633, 753, 1477, 1757, 4009, 4431, 4769, 5271, 12027, 14307, 28063, 33383, 52961, 84189, 100149, 158883, 370727, 1006259, 1112181, 3018777, 7043813, 21131439]

約数ペア:

[(1, 21131439), (3, 7043813), (7, 3018777), (19, 1112181), (21, 1006259), (57, 370727), (133, 158883), (211, 100149), (251, 84189), (399, 52961), (633, 33383), (753, 28063), (1477, 14307), (1757, 12027), (4009, 5271), (4431, 4769)]