21254779

素因数分解:

$7^2\times {\mathrm{13}}^1\times {\mathrm{61}}^1\times {\mathrm{547}}^1$

素因数の和:635

約数の個数: 24

約数和(自身を含む): 27112848

約数和(自身を除く): 5858069

約数列:

[1, 7, 13, 49, 61, 91, 427, 547, 637, 793, 2989, 3829, 5551, 7111, 26803, 33367, 38857, 49777, 233569, 348439, 433771, 1634983, 3036397, 21254779]

約数ペア:

[(1, 21254779), (7, 3036397), (13, 1634983), (49, 433771), (61, 348439), (91, 233569), (427, 49777), (547, 38857), (637, 33367), (793, 26803), (2989, 7111), (3829, 5551)]