18981225

素因数分解:

$3^2\times 5^2\times {\mathrm{29}}^1\times {\mathrm{2909}}^1$

素因数の和:2954

約数の個数: 36

約数和(自身を含む): 35181900

約数和(自身を除く): 16200675

約数列:

[1, 3, 5, 9, 15, 25, 29, 45, 75, 87, 145, 225, 261, 435, 725, 1305, 2175, 2909, 6525, 8727, 14545, 26181, 43635, 72725, 84361, 130905, 218175, 253083, 421805, 654525, 759249, 1265415, 2109025, 3796245, 6327075, 18981225]

約数ペア:

[(1, 18981225), (3, 6327075), (5, 3796245), (9, 2109025), (15, 1265415), (25, 759249), (29, 654525), (45, 421805), (75, 253083), (87, 218175), (145, 130905), (225, 84361), (261, 72725), (435, 43635), (725, 26181), (1305, 14545), (2175, 8727), (2909, 6525)]