20640339

素因数分解:

$3^4\times {\mathrm{37}}^1\times {\mathrm{71}}^1\times {\mathrm{97}}^1$

素因数の和:217

約数の個数: 40

約数和(自身を含む): 32443488

約数和(自身を除く): 11803149

約数列:

[1, 3, 9, 27, 37, 71, 81, 97, 111, 213, 291, 333, 639, 873, 999, 1917, 2619, 2627, 2997, 3589, 5751, 6887, 7857, 7881, 10767, 20661, 23643, 32301, 61983, 70929, 96903, 185949, 212787, 254819, 290709, 557847, 764457, 2293371, 6880113, 20640339]

約数ペア:

[(1, 20640339), (3, 6880113), (9, 2293371), (27, 764457), (37, 557847), (71, 290709), (81, 254819), (97, 212787), (111, 185949), (213, 96903), (291, 70929), (333, 61983), (639, 32301), (873, 23643), (999, 20661), (1917, 10767), (2619, 7881), (2627, 7857), (2997, 6887), (3589, 5751)]