19901260

素因数分解:

$2^2\times 5^1\times {\mathrm{43}}^1\times {\mathrm{73}}^1\times {\mathrm{317}}^1$

素因数の和:442

約数の個数: 48

約数和(自身を含む): 43487136

約数和(自身を除く): 23585876

約数列:

[1, 2, 4, 5, 10, 20, 43, 73, 86, 146, 172, 215, 292, 317, 365, 430, 634, 730, 860, 1268, 1460, 1585, 3139, 3170, 6278, 6340, 12556, 13631, 15695, 23141, 27262, 31390, 46282, 54524, 62780, 68155, 92564, 115705, 136310, 231410, 272620, 462820, 995063, 1990126, 3980252, 4975315, 9950630, 19901260]

約数ペア:

[(1, 19901260), (2, 9950630), (4, 4975315), (5, 3980252), (10, 1990126), (20, 995063), (43, 462820), (73, 272620), (86, 231410), (146, 136310), (172, 115705), (215, 92564), (292, 68155), (317, 62780), (365, 54524), (430, 46282), (634, 31390), (730, 27262), (860, 23141), (1268, 15695), (1460, 13631), (1585, 12556), (3139, 6340), (3170, 6278)]