21152905

素因数分解:

$5^1\times {\mathrm{67}}^1\times {\mathrm{233}}^1\times {\mathrm{271}}^1$

素因数の和:576

約数の個数: 16

約数和(自身を含む): 25968384

約数和(自身を除く): 4815479

約数列:

[1, 5, 67, 233, 271, 335, 1165, 1355, 15611, 18157, 63143, 78055, 90785, 315715, 4230581, 21152905]

約数ペア:

[(1, 21152905), (5, 4230581), (67, 315715), (233, 90785), (271, 78055), (335, 63143), (1165, 18157), (1355, 15611)]