21072021

素因数分解:

$3^1\times {\mathrm{43}}^1\times {\mathrm{379}}^1\times {\mathrm{431}}^1$

素因数の和:856

約数の個数: 16

約数和(自身を含む): 28892160

約数和(自身を除く): 7820139

約数列:

[1, 3, 43, 129, 379, 431, 1137, 1293, 16297, 18533, 48891, 55599, 163349, 490047, 7024007, 21072021]

約数ペア:

[(1, 21072021), (3, 7024007), (43, 490047), (129, 163349), (379, 55599), (431, 48891), (1137, 18533), (1293, 16297)]