21871265

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{19793}}^1$

素因数の和:19828

約数の個数: 16

約数和(自身を含む): 29928528

約数和(自身を除く): 8057263

約数列:

[1, 5, 13, 17, 65, 85, 221, 1105, 19793, 98965, 257309, 336481, 1286545, 1682405, 4374253, 21871265]

約数ペア:

[(1, 21871265), (5, 4374253), (13, 1682405), (17, 1286545), (65, 336481), (85, 257309), (221, 98965), (1105, 19793)]