18019925

素因数分解:

$5^2\times 7^1\times {\mathrm{11}}^2\times {\mathrm{23}}^1\times {\mathrm{37}}^1$

素因数の和:99

約数の個数: 72

約数和(自身を含む): 30081408

約数和(自身を除く): 12061483

約数列:

[1, 5, 7, 11, 23, 25, 35, 37, 55, 77, 115, 121, 161, 175, 185, 253, 259, 275, 385, 407, 575, 605, 805, 847, 851, 925, 1265, 1295, 1771, 1925, 2035, 2783, 2849, 3025, 4025, 4235, 4255, 4477, 5957, 6325, 6475, 8855, 9361, 10175, 13915, 14245, 19481, 21175, 21275, 22385, 29785, 31339, 44275, 46805, 65527, 69575, 71225, 97405, 102971, 111925, 148925, 156695, 234025, 327635, 487025, 514855, 720797, 783475, 1638175, 2574275, 3603985, 18019925]

約数ペア:

[(1, 18019925), (5, 3603985), (7, 2574275), (11, 1638175), (23, 783475), (25, 720797), (35, 514855), (37, 487025), (55, 327635), (77, 234025), (115, 156695), (121, 148925), (161, 111925), (175, 102971), (185, 97405), (253, 71225), (259, 69575), (275, 65527), (385, 46805), (407, 44275), (575, 31339), (605, 29785), (805, 22385), (847, 21275), (851, 21175), (925, 19481), (1265, 14245), (1295, 13915), (1771, 10175), (1925, 9361), (2035, 8855), (2783, 6475), (2849, 6325), (3025, 5957), (4025, 4477), (4235, 4255)]