21109985

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{79}}^1\times {\mathrm{4111}}^1$

素因数の和:4208

約数の個数: 16

約数和(自身を含む): 27632640

約数和(自身を除く): 6522655

約数列:

[1, 5, 13, 65, 79, 395, 1027, 4111, 5135, 20555, 53443, 267215, 324769, 1623845, 4221997, 21109985]

約数ペア:

[(1, 21109985), (5, 4221997), (13, 1623845), (65, 324769), (79, 267215), (395, 53443), (1027, 20555), (4111, 5135)]