21561471

素因数分解:

$3^4\times {\mathrm{29}}^1\times {\mathrm{67}}^1\times {\mathrm{137}}^1$

素因数の和:245

約数の個数: 40

約数和(自身を含む): 34063920

約数和(自身を除く): 12502449

約数列:

[1, 3, 9, 27, 29, 67, 81, 87, 137, 201, 261, 411, 603, 783, 1233, 1809, 1943, 2349, 3699, 3973, 5427, 5829, 9179, 11097, 11919, 17487, 27537, 35757, 52461, 82611, 107271, 157383, 247833, 266191, 321813, 743499, 798573, 2395719, 7187157, 21561471]

約数ペア:

[(1, 21561471), (3, 7187157), (9, 2395719), (27, 798573), (29, 743499), (67, 321813), (81, 266191), (87, 247833), (137, 157383), (201, 107271), (261, 82611), (411, 52461), (603, 35757), (783, 27537), (1233, 17487), (1809, 11919), (1943, 11097), (2349, 9179), (3699, 5829), (3973, 5427)]