20459271

素因数分解:

$3^1\times 7^1\times {\mathrm{43}}^1\times {\mathrm{139}}^1\times {\mathrm{163}}^1$

素因数の和:355

約数の個数: 32

約数和(自身を含む): 32327680

約数和(自身を除く): 11868409

約数列:

[1, 3, 7, 21, 43, 129, 139, 163, 301, 417, 489, 903, 973, 1141, 2919, 3423, 5977, 7009, 17931, 21027, 22657, 41839, 49063, 67971, 125517, 147189, 158599, 475797, 974251, 2922753, 6819757, 20459271]

約数ペア:

[(1, 20459271), (3, 6819757), (7, 2922753), (21, 974251), (43, 475797), (129, 158599), (139, 147189), (163, 125517), (301, 67971), (417, 49063), (489, 41839), (903, 22657), (973, 21027), (1141, 17931), (2919, 7009), (3423, 5977)]