21720152

素因数分解:

$2^3\times {\mathrm{17}}^1\times {\mathrm{159707}}^1$

素因数の和:159730

約数の個数: 16

約数和(自身を含む): 43121160

約数和(自身を除く): 21401008

約数列:

[1, 2, 4, 8, 17, 34, 68, 136, 159707, 319414, 638828, 1277656, 2715019, 5430038, 10860076, 21720152]

約数ペア:

[(1, 21720152), (2, 10860076), (4, 5430038), (8, 2715019), (17, 1277656), (34, 638828), (68, 319414), (136, 159707)]