19911220

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{142223}}^1$

素因数の和:142239

約数の個数: 24

約数和(自身を含む): 47787264

約数和(自身を除く): 27876044

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 140, 142223, 284446, 568892, 711115, 995561, 1422230, 1991122, 2844460, 3982244, 4977805, 9955610, 19911220]

約数ペア:

[(1, 19911220), (2, 9955610), (4, 4977805), (5, 3982244), (7, 2844460), (10, 1991122), (14, 1422230), (20, 995561), (28, 711115), (35, 568892), (70, 284446), (140, 142223)]