257480

素因数分解:

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

素因数の和:209

約数の個数: 32

約数和(自身を含む): 597240

約数和(自身を除く): 339760

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 41, 82, 157, 164, 205, 314, 328, 410, 628, 785, 820, 1256, 1570, 1640, 3140, 6280, 6437, 12874, 25748, 32185, 51496, 64370, 128740, 257480]

約数ペア:

[(1, 257480), (2, 128740), (4, 64370), (5, 51496), (8, 32185), (10, 25748), (20, 12874), (40, 6437), (41, 6280), (82, 3140), (157, 1640), (164, 1570), (205, 1256), (314, 820), (328, 785), (410, 628)]