21280105

素因数分解:

$5^1\times 7^1\times {\mathrm{11}}^1\times {\mathrm{31}}^1\times {\mathrm{1783}}^1$

素因数の和:1837

約数の個数: 32

約数和(自身を含む): 32882688

約数和(自身を除く): 11602583

約数列:

[1, 5, 7, 11, 31, 35, 55, 77, 155, 217, 341, 385, 1085, 1705, 1783, 2387, 8915, 11935, 12481, 19613, 55273, 62405, 98065, 137291, 276365, 386911, 608003, 686455, 1934555, 3040015, 4256021, 21280105]

約数ペア:

[(1, 21280105), (5, 4256021), (7, 3040015), (11, 1934555), (31, 686455), (35, 608003), (55, 386911), (77, 276365), (155, 137291), (217, 98065), (341, 62405), (385, 55273), (1085, 19613), (1705, 12481), (1783, 11935), (2387, 8915)]