20921229

素因数分解:

$3^2\times 7^1\times {\mathrm{83}}^1\times {\mathrm{4001}}^1$

素因数の和:4097

約数の個数: 24

約数和(自身を含む): 34961472

約数和(自身を除く): 14040243

約数列:

[1, 3, 7, 9, 21, 63, 83, 249, 581, 747, 1743, 4001, 5229, 12003, 28007, 36009, 84021, 252063, 332083, 996249, 2324581, 2988747, 6973743, 20921229]

約数ペア:

[(1, 20921229), (3, 6973743), (7, 2988747), (9, 2324581), (21, 996249), (63, 332083), (83, 252063), (249, 84021), (581, 36009), (747, 28007), (1743, 12003), (4001, 5229)]