21204891

素因数分解:

$3^2\times {\mathrm{43}}^1\times {\mathrm{157}}^1\times {\mathrm{349}}^1$

素因数の和:555

約数の個数: 24

約数和(自身を含む): 31631600

約数和(自身を除く): 10426709

約数列:

[1, 3, 9, 43, 129, 157, 349, 387, 471, 1047, 1413, 3141, 6751, 15007, 20253, 45021, 54793, 60759, 135063, 164379, 493137, 2356099, 7068297, 21204891]

約数ペア:

[(1, 21204891), (3, 7068297), (9, 2356099), (43, 493137), (129, 164379), (157, 135063), (349, 60759), (387, 54793), (471, 45021), (1047, 20253), (1413, 15007), (3141, 6751)]