19987664

素因数分解:

$2^4\times {\mathrm{41}}^1\times {\mathrm{30469}}^1$

素因数の和:30518

約数の個数: 20

約数和(自身を含む): 39671940

約数和(自身を除く): 19684276

約数列:

[1, 2, 4, 8, 16, 41, 82, 164, 328, 656, 30469, 60938, 121876, 243752, 487504, 1249229, 2498458, 4996916, 9993832, 19987664]

約数ペア:

[(1, 19987664), (2, 9993832), (4, 4996916), (8, 2498458), (16, 1249229), (41, 487504), (82, 243752), (164, 121876), (328, 60938), (656, 30469)]