128740

素因数分解:

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

素因数の和:207

約数の個数: 24

約数和(自身を含む): 278712

約数和(自身を除く): 149972

約数列:

[1, 2, 4, 5, 10, 20, 41, 82, 157, 164, 205, 314, 410, 628, 785, 820, 1570, 3140, 6437, 12874, 25748, 32185, 64370, 128740]

約数ペア:

[(1, 128740), (2, 64370), (4, 32185), (5, 25748), (10, 12874), (20, 6437), (41, 3140), (82, 1570), (157, 820), (164, 785), (205, 628), (314, 410)]