20391861

素因数分解:

$3^1\times 7^1\times {\mathrm{307}}^1\times {\mathrm{3163}}^1$

素因数の和:3480

約数の個数: 16

約数和(自身を含む): 31184384

約数和(自身を除く): 10792523

約数列:

[1, 3, 7, 21, 307, 921, 2149, 3163, 6447, 9489, 22141, 66423, 971041, 2913123, 6797287, 20391861]

約数ペア:

[(1, 20391861), (3, 6797287), (7, 2913123), (21, 971041), (307, 66423), (921, 22141), (2149, 9489), (3163, 6447)]