21288040

素因数分解:

$2^3\times 5^1\times {\mathrm{103}}^1\times {\mathrm{5167}}^1$

素因数の和:5281

約数の個数: 32

約数和(自身を含む): 48372480

約数和(自身を除く): 27084440

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 103, 206, 412, 515, 824, 1030, 2060, 4120, 5167, 10334, 20668, 25835, 41336, 51670, 103340, 206680, 532201, 1064402, 2128804, 2661005, 4257608, 5322010, 10644020, 21288040]

約数ペア:

[(1, 21288040), (2, 10644020), (4, 5322010), (5, 4257608), (8, 2661005), (10, 2128804), (20, 1064402), (40, 532201), (103, 206680), (206, 103340), (412, 51670), (515, 41336), (824, 25835), (1030, 20668), (2060, 10334), (4120, 5167)]