21247989

素因数分解:

$3^1\times 7^1\times {\mathrm{31}}^1\times {\mathrm{127}}^1\times {\mathrm{257}}^1$

素因数の和:425

約数の個数: 32

約数和(自身を含む): 33816576

約数和(自身を除く): 12568587

約数列:

[1, 3, 7, 21, 31, 93, 127, 217, 257, 381, 651, 771, 889, 1799, 2667, 3937, 5397, 7967, 11811, 23901, 27559, 32639, 55769, 82677, 97917, 167307, 228473, 685419, 1011809, 3035427, 7082663, 21247989]

約数ペア:

[(1, 21247989), (3, 7082663), (7, 3035427), (21, 1011809), (31, 685419), (93, 228473), (127, 167307), (217, 97917), (257, 82677), (381, 55769), (651, 32639), (771, 27559), (889, 23901), (1799, 11811), (2667, 7967), (3937, 5397)]