20681991

素因数分解:

$3^2\times {\mathrm{11}}^1\times {\mathrm{23}}^1\times {\mathrm{31}}^1\times {\mathrm{293}}^1$

素因数の和:364

約数の個数: 48

約数和(自身を含む): 35223552

約数和(自身を除く): 14541561

約数列:

[1, 3, 9, 11, 23, 31, 33, 69, 93, 99, 207, 253, 279, 293, 341, 713, 759, 879, 1023, 2139, 2277, 2637, 3069, 3223, 6417, 6739, 7843, 9083, 9669, 20217, 23529, 27249, 29007, 60651, 70587, 74129, 81747, 99913, 208909, 222387, 299739, 626727, 667161, 899217, 1880181, 2297999, 6893997, 20681991]

約数ペア:

[(1, 20681991), (3, 6893997), (9, 2297999), (11, 1880181), (23, 899217), (31, 667161), (33, 626727), (69, 299739), (93, 222387), (99, 208909), (207, 99913), (253, 81747), (279, 74129), (293, 70587), (341, 60651), (713, 29007), (759, 27249), (879, 23529), (1023, 20217), (2139, 9669), (2277, 9083), (2637, 7843), (3069, 6739), (3223, 6417)]