20928551

素因数分解:

$7^1\times {\mathrm{23}}^1\times {\mathrm{61}}^1\times {\mathrm{2131}}^1$

素因数の和:2222

約数の個数: 16

約数和(自身を含む): 25379328

約数和(自身を除く): 4450777

約数列:

[1, 7, 23, 61, 161, 427, 1403, 2131, 9821, 14917, 49013, 129991, 343091, 909937, 2989793, 20928551]

約数ペア:

[(1, 20928551), (7, 2989793), (23, 909937), (61, 343091), (161, 129991), (427, 49013), (1403, 14917), (2131, 9821)]