21399987

素因数分解:

$3^1\times 7^1\times {\mathrm{179}}^1\times {\mathrm{5693}}^1$

素因数の和:5882

約数の個数: 16

約数和(自身を含む): 32797440

約数和(自身を除く): 11397453

約数列:

[1, 3, 7, 21, 179, 537, 1253, 3759, 5693, 17079, 39851, 119553, 1019047, 3057141, 7133329, 21399987]

約数ペア:

[(1, 21399987), (3, 7133329), (7, 3057141), (21, 1019047), (179, 119553), (537, 39851), (1253, 17079), (3759, 5693)]