18993821

素因数分解:

$7^2\times {\mathrm{11}}^1\times {\mathrm{131}}^1\times {\mathrm{269}}^1$

素因数の和:425

約数の個数: 24

約数和(自身を含む): 24377760

約数和(自身を除く): 5383939

約数列:

[1, 7, 11, 49, 77, 131, 269, 539, 917, 1441, 1883, 2959, 6419, 10087, 13181, 20713, 35239, 70609, 144991, 246673, 387629, 1726711, 2713403, 18993821]

約数ペア:

[(1, 18993821), (7, 2713403), (11, 1726711), (49, 387629), (77, 246673), (131, 144991), (269, 70609), (539, 35239), (917, 20713), (1441, 13181), (1883, 10087), (2959, 6419)]