19968025

素因数分解:

$5^2\times 7^1\times {\mathrm{11}}^2\times {\mathrm{23}}^1\times {\mathrm{41}}^1$

素因数の和:103

約数の個数: 72

約数和(自身を含む): 33247872

約数和(自身を除く): 13279847

約数列:

[1, 5, 7, 11, 23, 25, 35, 41, 55, 77, 115, 121, 161, 175, 205, 253, 275, 287, 385, 451, 575, 605, 805, 847, 943, 1025, 1265, 1435, 1771, 1925, 2255, 2783, 3025, 3157, 4025, 4235, 4715, 4961, 6325, 6601, 7175, 8855, 10373, 11275, 13915, 15785, 19481, 21175, 23575, 24805, 33005, 34727, 44275, 51865, 69575, 72611, 78925, 97405, 114103, 124025, 165025, 173635, 259325, 363055, 487025, 570515, 798721, 868175, 1815275, 2852575, 3993605, 19968025]

約数ペア:

[(1, 19968025), (5, 3993605), (7, 2852575), (11, 1815275), (23, 868175), (25, 798721), (35, 570515), (41, 487025), (55, 363055), (77, 259325), (115, 173635), (121, 165025), (161, 124025), (175, 114103), (205, 97405), (253, 78925), (275, 72611), (287, 69575), (385, 51865), (451, 44275), (575, 34727), (605, 33005), (805, 24805), (847, 23575), (943, 21175), (1025, 19481), (1265, 15785), (1435, 13915), (1771, 11275), (1925, 10373), (2255, 8855), (2783, 7175), (3025, 6601), (3157, 6325), (4025, 4961), (4235, 4715)]