21240945

素因数分解:

$3^2\times 5^1\times {\mathrm{11}}^2\times {\mathrm{47}}^1\times {\mathrm{83}}^1$

素因数の和:163

約数の個数: 72

約数和(自身を含む): 41827968

約数和(自身を除く): 20587023

約数列:

[1, 3, 5, 9, 11, 15, 33, 45, 47, 55, 83, 99, 121, 141, 165, 235, 249, 363, 415, 423, 495, 517, 605, 705, 747, 913, 1089, 1245, 1551, 1815, 2115, 2585, 2739, 3735, 3901, 4565, 4653, 5445, 5687, 7755, 8217, 10043, 11703, 13695, 17061, 19505, 23265, 28435, 30129, 35109, 41085, 42911, 50215, 51183, 58515, 85305, 90387, 128733, 150645, 175545, 214555, 255915, 386199, 451935, 472021, 643665, 1416063, 1930995, 2360105, 4248189, 7080315, 21240945]

約数ペア:

[(1, 21240945), (3, 7080315), (5, 4248189), (9, 2360105), (11, 1930995), (15, 1416063), (33, 643665), (45, 472021), (47, 451935), (55, 386199), (83, 255915), (99, 214555), (121, 175545), (141, 150645), (165, 128733), (235, 90387), (249, 85305), (363, 58515), (415, 51183), (423, 50215), (495, 42911), (517, 41085), (605, 35109), (705, 30129), (747, 28435), (913, 23265), (1089, 19505), (1245, 17061), (1551, 13695), (1815, 11703), (2115, 10043), (2585, 8217), (2739, 7755), (3735, 5687), (3901, 5445), (4565, 4653)]