21261247

素因数分解:

$7^2\times {\mathrm{19}}^1\times {\mathrm{41}}^1\times {\mathrm{557}}^1$

素因数の和:631

約数の個数: 24

約数和(自身を含む): 26717040

約数和(自身を除く): 5455793

約数列:

[1, 7, 19, 41, 49, 133, 287, 557, 779, 931, 2009, 3899, 5453, 10583, 22837, 27293, 38171, 74081, 159859, 433903, 518567, 1119013, 3037321, 21261247]

約数ペア:

[(1, 21261247), (7, 3037321), (19, 1119013), (41, 518567), (49, 433903), (133, 159859), (287, 74081), (557, 38171), (779, 27293), (931, 22837), (2009, 10583), (3899, 5453)]