21091305

素因数分解:

$3^1\times 5^1\times {\mathrm{17}}^1\times {\mathrm{107}}^1\times {\mathrm{773}}^1$

素因数の和:905

約数の個数: 32

約数和(自身を含む): 36111744

約数和(自身を除く): 15020439

約数列:

[1, 3, 5, 15, 17, 51, 85, 107, 255, 321, 535, 773, 1605, 1819, 2319, 3865, 5457, 9095, 11595, 13141, 27285, 39423, 65705, 82711, 197115, 248133, 413555, 1240665, 1406087, 4218261, 7030435, 21091305]

約数ペア:

[(1, 21091305), (3, 7030435), (5, 4218261), (15, 1406087), (17, 1240665), (51, 413555), (85, 248133), (107, 197115), (255, 82711), (321, 65705), (535, 39423), (773, 27285), (1605, 13141), (1819, 11595), (2319, 9095), (3865, 5457)]