19978946

素因数分解:

$2^1\times {\mathrm{13}}^1\times {\mathrm{307}}^1\times {\mathrm{2503}}^1$

素因数の和:2825

約数の個数: 16

約数和(自身を含む): 32391744

約数和(自身を除く): 12412798

約数列:

[1, 2, 13, 26, 307, 614, 2503, 3991, 5006, 7982, 32539, 65078, 768421, 1536842, 9989473, 19978946]

約数ペア:

[(1, 19978946), (2, 9989473), (13, 1536842), (26, 768421), (307, 65078), (614, 32539), (2503, 7982), (3991, 5006)]