21143255

素因数分解:

$5^1\times 7^2\times {\mathrm{211}}^1\times {\mathrm{409}}^1$

素因数の和:639

約数の個数: 24

約数和(自身を含む): 29726640

約数和(自身を除く): 8583385

約数列:

[1, 5, 7, 35, 49, 211, 245, 409, 1055, 1477, 2045, 2863, 7385, 10339, 14315, 20041, 51695, 86299, 100205, 431495, 604093, 3020465, 4228651, 21143255]

約数ペア:

[(1, 21143255), (5, 4228651), (7, 3020465), (35, 604093), (49, 431495), (211, 100205), (245, 86299), (409, 51695), (1055, 20041), (1477, 14315), (2045, 10339), (2863, 7385)]