20897317

素因数分解:

$7^1\times {\mathrm{23}}^1\times {\mathrm{31}}^1\times {\mathrm{53}}^1\times {\mathrm{79}}^1$

素因数の和:193

約数の個数: 32

約数和(自身を含む): 26542080

約数和(自身を除く): 5644763

約数列:

[1, 7, 23, 31, 53, 79, 161, 217, 371, 553, 713, 1219, 1643, 1817, 2449, 4187, 4991, 8533, 11501, 12719, 17143, 29309, 37789, 56327, 96301, 129797, 264523, 394289, 674107, 908579, 2985331, 20897317]

約数ペア:

[(1, 20897317), (7, 2985331), (23, 908579), (31, 674107), (53, 394289), (79, 264523), (161, 129797), (217, 96301), (371, 56327), (553, 37789), (713, 29309), (1219, 17143), (1643, 12719), (1817, 11501), (2449, 8533), (4187, 4991)]