21488895

素因数分解:

$3^4\times 5^1\times {\mathrm{97}}^1\times {\mathrm{547}}^1$

素因数の和:661

約数の個数: 40

約数和(自身を含む): 38989104

約数和(自身を除く): 17500209

約数列:

[1, 3, 5, 9, 15, 27, 45, 81, 97, 135, 291, 405, 485, 547, 873, 1455, 1641, 2619, 2735, 4365, 4923, 7857, 8205, 13095, 14769, 24615, 39285, 44307, 53059, 73845, 159177, 221535, 265295, 477531, 795885, 1432593, 2387655, 4297779, 7162965, 21488895]

約数ペア:

[(1, 21488895), (3, 7162965), (5, 4297779), (9, 2387655), (15, 1432593), (27, 795885), (45, 477531), (81, 265295), (97, 221535), (135, 159177), (291, 73845), (405, 53059), (485, 44307), (547, 39285), (873, 24615), (1455, 14769), (1641, 13095), (2619, 8205), (2735, 7857), (4365, 4923)]