21136885

素因数分解:

$5^1\times 7^2\times {\mathrm{11}}^2\times {\mathrm{23}}^1\times {\mathrm{31}}^1$

素因数の和:95

約数の個数: 72

約数和(自身を含む): 34933248

約数和(自身を除く): 13796363

約数列:

[1, 5, 7, 11, 23, 31, 35, 49, 55, 77, 115, 121, 155, 161, 217, 245, 253, 341, 385, 539, 605, 713, 805, 847, 1085, 1127, 1265, 1519, 1705, 1771, 2387, 2695, 2783, 3565, 3751, 4235, 4991, 5635, 5929, 7595, 7843, 8855, 11935, 12397, 13915, 16709, 18755, 19481, 24955, 26257, 29645, 34937, 39215, 54901, 61985, 83545, 86273, 97405, 131285, 136367, 174685, 183799, 274505, 384307, 431365, 603911, 681835, 918995, 1921535, 3019555, 4227377, 21136885]

約数ペア:

[(1, 21136885), (5, 4227377), (7, 3019555), (11, 1921535), (23, 918995), (31, 681835), (35, 603911), (49, 431365), (55, 384307), (77, 274505), (115, 183799), (121, 174685), (155, 136367), (161, 131285), (217, 97405), (245, 86273), (253, 83545), (341, 61985), (385, 54901), (539, 39215), (605, 34937), (713, 29645), (805, 26257), (847, 24955), (1085, 19481), (1127, 18755), (1265, 16709), (1519, 13915), (1705, 12397), (1771, 11935), (2387, 8855), (2695, 7843), (2783, 7595), (3565, 5929), (3751, 5635), (4235, 4991)]