21198140

素因数分解:

$2^2\times 5^1\times {\mathrm{43}}^1\times {\mathrm{157}}^2$

素因数の和:366

約数の個数: 36

約数和(自身を含む): 45843336

約数和(自身を除く): 24645196

約数列:

[1, 2, 4, 5, 10, 20, 43, 86, 157, 172, 215, 314, 430, 628, 785, 860, 1570, 3140, 6751, 13502, 24649, 27004, 33755, 49298, 67510, 98596, 123245, 135020, 246490, 492980, 1059907, 2119814, 4239628, 5299535, 10599070, 21198140]

約数ペア:

[(1, 21198140), (2, 10599070), (4, 5299535), (5, 4239628), (10, 2119814), (20, 1059907), (43, 492980), (86, 246490), (157, 135020), (172, 123245), (215, 98596), (314, 67510), (430, 49298), (628, 33755), (785, 27004), (860, 24649), (1570, 13502), (3140, 6751)]