21000947997

素因数分解:

$3^1\times {\mathrm{103}}^1\times {\mathrm{181}}^1\times {\mathrm{463}}^1\times {\mathrm{811}}^1$

素因数の和:1561

約数の個数: 32

約数和(自身を含む): 28525858816

約数和(自身を除く): 7524910819

約数列:

[1, 3, 103, 181, 309, 463, 543, 811, 1389, 2433, 18643, 47689, 55929, 83533, 83803, 143067, 146791, 250599, 251409, 375493, 440373, 1126479, 8631709, 15119473, 25895127, 38675779, 45358419, 67964233, 116027337, 203892699, 7000315999, 21000947997]

約数ペア:

[(1, 21000947997), (3, 7000315999), (103, 203892699), (181, 116027337), (309, 67964233), (463, 45358419), (543, 38675779), (811, 25895127), (1389, 15119473), (2433, 8631709), (18643, 1126479), (47689, 440373), (55929, 375493), (83533, 251409), (83803, 250599), (143067, 146791)]