81294020

素因数分解:

$2^2\times 5^1\times {\mathrm{47}}^1\times {\mathrm{197}}^1\times {\mathrm{439}}^1$

素因数の和:692

約数の個数: 48

約数和(自身を含む): 175633920

約数和(自身を除く): 94339900

約数列:

[1, 2, 4, 5, 10, 20, 47, 94, 188, 197, 235, 394, 439, 470, 788, 878, 940, 985, 1756, 1970, 2195, 3940, 4390, 8780, 9259, 18518, 20633, 37036, 41266, 46295, 82532, 86483, 92590, 103165, 172966, 185180, 206330, 345932, 412660, 432415, 864830, 1729660, 4064701, 8129402, 16258804, 20323505, 40647010, 81294020]

約数ペア:

[(1, 81294020), (2, 40647010), (4, 20323505), (5, 16258804), (10, 8129402), (20, 4064701), (47, 1729660), (94, 864830), (188, 432415), (197, 412660), (235, 345932), (394, 206330), (439, 185180), (470, 172966), (788, 103165), (878, 92590), (940, 86483), (985, 82532), (1756, 46295), (1970, 41266), (2195, 37036), (3940, 20633), (4390, 18518), (8780, 9259)]