20561919

素因数分解:

$3^1\times 7^2\times {\mathrm{137}}^1\times {\mathrm{1021}}^1$

素因数の和:1175

約数の個数: 24

約数和(自身を含む): 32156208

約数和(自身を除く): 11594289

約数列:

[1, 3, 7, 21, 49, 137, 147, 411, 959, 1021, 2877, 3063, 6713, 7147, 20139, 21441, 50029, 139877, 150087, 419631, 979139, 2937417, 6853973, 20561919]

約数ペア:

[(1, 20561919), (3, 6853973), (7, 2937417), (21, 979139), (49, 419631), (137, 150087), (147, 139877), (411, 50029), (959, 21441), (1021, 20139), (2877, 7147), (3063, 6713)]