20988680

素因数分解:

$2^3\times 5^1\times {\mathrm{647}}^1\times {\mathrm{811}}^1$

素因数の和:1469

約数の個数: 32

約数和(自身を含む): 47355840

約数和(自身を除く): 26367160

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 647, 811, 1294, 1622, 2588, 3235, 3244, 4055, 5176, 6470, 6488, 8110, 12940, 16220, 25880, 32440, 524717, 1049434, 2098868, 2623585, 4197736, 5247170, 10494340, 20988680]

約数ペア:

[(1, 20988680), (2, 10494340), (4, 5247170), (5, 4197736), (8, 2623585), (10, 2098868), (20, 1049434), (40, 524717), (647, 32440), (811, 25880), (1294, 16220), (1622, 12940), (2588, 8110), (3235, 6488), (3244, 6470), (4055, 5176)]