1287400

素因数分解:

$2^3\times 5^2\times {\mathrm{41}}^1\times {\mathrm{157}}^1$

素因数の和:214

約数の個数: 48

約数和(自身を含む): 3085740

約数和(自身を除く): 1798340

約数列:

[1, 2, 4, 5, 8, 10, 20, 25, 40, 41, 50, 82, 100, 157, 164, 200, 205, 314, 328, 410, 628, 785, 820, 1025, 1256, 1570, 1640, 2050, 3140, 3925, 4100, 6280, 6437, 7850, 8200, 12874, 15700, 25748, 31400, 32185, 51496, 64370, 128740, 160925, 257480, 321850, 643700, 1287400]

約数ペア:

[(1, 1287400), (2, 643700), (4, 321850), (5, 257480), (8, 160925), (10, 128740), (20, 64370), (25, 51496), (40, 32185), (41, 31400), (50, 25748), (82, 15700), (100, 12874), (157, 8200), (164, 7850), (200, 6437), (205, 6280), (314, 4100), (328, 3925), (410, 3140), (628, 2050), (785, 1640), (820, 1570), (1025, 1256)]