21159985

素因数分解:

$5^1\times 7^1\times {\mathrm{11}}^1\times {\mathrm{17}}^1\times {\mathrm{53}}^1\times {\mathrm{61}}^1$

素因数の和:154

約数の個数: 64

約数和(自身を含む): 34712064

約数和(自身を除く): 13552079

約数列:

[1, 5, 7, 11, 17, 35, 53, 55, 61, 77, 85, 119, 187, 265, 305, 371, 385, 427, 583, 595, 671, 901, 935, 1037, 1309, 1855, 2135, 2915, 3233, 3355, 4081, 4505, 4697, 5185, 6307, 6545, 7259, 9911, 11407, 16165, 20405, 22631, 23485, 31535, 35563, 36295, 49555, 54961, 57035, 69377, 79849, 113155, 177815, 248941, 274805, 346885, 384727, 399245, 604571, 1244705, 1923635, 3022855, 4231997, 21159985]

約数ペア:

[(1, 21159985), (5, 4231997), (7, 3022855), (11, 1923635), (17, 1244705), (35, 604571), (53, 399245), (55, 384727), (61, 346885), (77, 274805), (85, 248941), (119, 177815), (187, 113155), (265, 79849), (305, 69377), (371, 57035), (385, 54961), (427, 49555), (583, 36295), (595, 35563), (671, 31535), (901, 23485), (935, 22631), (1037, 20405), (1309, 16165), (1855, 11407), (2135, 9911), (2915, 7259), (3233, 6545), (3355, 6307), (4081, 5185), (4505, 4697)]