18780111

素因数分解:

$3^2\times 7^1\times {\mathrm{307}}^1\times {\mathrm{971}}^1$

素因数の和:1291

約数の個数: 24

約数和(自身を含む): 31135104

約数和(自身を除く): 12354993

約数列:

[1, 3, 7, 9, 21, 63, 307, 921, 971, 2149, 2763, 2913, 6447, 6797, 8739, 19341, 20391, 61173, 298097, 894291, 2086679, 2682873, 6260037, 18780111]

約数ペア:

[(1, 18780111), (3, 6260037), (7, 2682873), (9, 2086679), (21, 894291), (63, 298097), (307, 61173), (921, 20391), (971, 19341), (2149, 8739), (2763, 6797), (2913, 6447)]