21491001

素因数分解:

$3^4\times 7^1\times {\mathrm{29}}^1\times {\mathrm{1307}}^1$

素因数の和:1355

約数の個数: 40

約数和(自身を含む): 37984320

約数和(自身を除く): 16493319

約数列:

[1, 3, 7, 9, 21, 27, 29, 63, 81, 87, 189, 203, 261, 567, 609, 783, 1307, 1827, 2349, 3921, 5481, 9149, 11763, 16443, 27447, 35289, 37903, 82341, 105867, 113709, 247023, 265321, 341127, 741069, 795963, 1023381, 2387889, 3070143, 7163667, 21491001]

約数ペア:

[(1, 21491001), (3, 7163667), (7, 3070143), (9, 2387889), (21, 1023381), (27, 795963), (29, 741069), (63, 341127), (81, 265321), (87, 247023), (189, 113709), (203, 105867), (261, 82341), (567, 37903), (609, 35289), (783, 27447), (1307, 16443), (1827, 11763), (2349, 9149), (3921, 5481)]