21808705

素因数分解:

$5^1\times {\mathrm{17}}^1\times {\mathrm{47}}^1\times {\mathrm{53}}^1\times {\mathrm{103}}^1$

素因数の和:225

約数の個数: 32

約数和(自身を含む): 29113344

約数和(自身を除く): 7304639

約数列:

[1, 5, 17, 47, 53, 85, 103, 235, 265, 515, 799, 901, 1751, 2491, 3995, 4505, 4841, 5459, 8755, 12455, 24205, 27295, 42347, 82297, 92803, 211735, 256573, 411485, 464015, 1282865, 4361741, 21808705]

約数ペア:

[(1, 21808705), (5, 4361741), (17, 1282865), (47, 464015), (53, 411485), (85, 256573), (103, 211735), (235, 92803), (265, 82297), (515, 42347), (799, 27295), (901, 24205), (1751, 12455), (2491, 8755), (3995, 5459), (4505, 4841)]