21102905

素因数分解:

$5^1\times {\mathrm{41}}^1\times {\mathrm{311}}^1\times {\mathrm{331}}^1$

素因数の和:688

約数の個数: 16

約数和(自身を含む): 26103168

約数和(自身を除く): 5000263

約数列:

[1, 5, 41, 205, 311, 331, 1555, 1655, 12751, 13571, 63755, 67855, 102941, 514705, 4220581, 21102905]

約数ペア:

[(1, 21102905), (5, 4220581), (41, 514705), (205, 102941), (311, 67855), (331, 63755), (1555, 13571), (1655, 12751)]