21210417

素因数分解:

$3^4\times {\mathrm{31}}^1\times {\mathrm{8447}}^1$

素因数の和:8490

約数の個数: 20

約数和(自身を含む): 32710656

約数和(自身を除く): 11500239

約数列:

[1, 3, 9, 27, 31, 81, 93, 279, 837, 2511, 8447, 25341, 76023, 228069, 261857, 684207, 785571, 2356713, 7070139, 21210417]

約数ペア:

[(1, 21210417), (3, 7070139), (9, 2356713), (27, 785571), (31, 684207), (81, 261857), (93, 228069), (279, 76023), (837, 25341), (2511, 8447)]