21285915

素因数分解:

$3^1\times 5^1\times 7^1\times {\mathrm{37}}^1\times {\mathrm{5479}}^1$

素因数の和:5531

約数の個数: 32

約数和(自身を含む): 39982080

約数和(自身を除く): 18696165

約数列:

[1, 3, 5, 7, 15, 21, 35, 37, 105, 111, 185, 259, 555, 777, 1295, 3885, 5479, 16437, 27395, 38353, 82185, 115059, 191765, 202723, 575295, 608169, 1013615, 1419061, 3040845, 4257183, 7095305, 21285915]

約数ペア:

[(1, 21285915), (3, 7095305), (5, 4257183), (7, 3040845), (15, 1419061), (21, 1013615), (35, 608169), (37, 575295), (105, 202723), (111, 191765), (185, 115059), (259, 82185), (555, 38353), (777, 27395), (1295, 16437), (3885, 5479)]