21388205

素因数分解:

$5^1\times {\mathrm{19}}^1\times {\mathrm{149}}^1\times {\mathrm{1511}}^1$

素因数の和:1684

約数の個数: 16

約数和(自身を含む): 27216000

約数和(自身を除く): 5827795

約数列:

[1, 5, 19, 95, 149, 745, 1511, 2831, 7555, 14155, 28709, 143545, 225139, 1125695, 4277641, 21388205]

約数ペア:

[(1, 21388205), (5, 4277641), (19, 1125695), (95, 225139), (149, 143545), (745, 28709), (1511, 14155), (2831, 7555)]