991221

素因数分解:

$3^1\times 7^2\times {\mathrm{11}}^1\times {\mathrm{613}}^1$

素因数の和:641

約数の個数: 24

約数和(自身を含む): 1679904

約数和(自身を除く): 688683

約数列:

[1, 3, 7, 11, 21, 33, 49, 77, 147, 231, 539, 613, 1617, 1839, 4291, 6743, 12873, 20229, 30037, 47201, 90111, 141603, 330407, 991221]

約数ペア:

[(1, 991221), (3, 330407), (7, 141603), (11, 90111), (21, 47201), (33, 30037), (49, 20229), (77, 12873), (147, 6743), (231, 4291), (539, 1839), (613, 1617)]