21077181

素因数分解:

$3^2\times {\mathrm{43}}^1\times {\mathrm{107}}^1\times {\mathrm{509}}^1$

素因数の和:665

約数の個数: 24

約数和(自身を含む): 31505760

約数和(自身を除く): 10428579

約数列:

[1, 3, 9, 43, 107, 129, 321, 387, 509, 963, 1527, 4581, 4601, 13803, 21887, 41409, 54463, 65661, 163389, 196983, 490167, 2341909, 7025727, 21077181]

約数ペア:

[(1, 21077181), (3, 7025727), (9, 2341909), (43, 490167), (107, 196983), (129, 163389), (321, 65661), (387, 54463), (509, 41409), (963, 21887), (1527, 13803), (4581, 4601)]