20664819

素因数分解:

$3^2\times 7^2\times {\mathrm{47}}^1\times {\mathrm{997}}^1$

素因数の和:1064

約数の個数: 36

約数和(自身を含む): 35496864

約数和(自身を除く): 14832045

約数列:

[1, 3, 7, 9, 21, 47, 49, 63, 141, 147, 329, 423, 441, 987, 997, 2303, 2961, 2991, 6909, 6979, 8973, 20727, 20937, 46859, 48853, 62811, 140577, 146559, 328013, 421731, 439677, 984039, 2296091, 2952117, 6888273, 20664819]

約数ペア:

[(1, 20664819), (3, 6888273), (7, 2952117), (9, 2296091), (21, 984039), (47, 439677), (49, 421731), (63, 328013), (141, 146559), (147, 140577), (329, 62811), (423, 48853), (441, 46859), (987, 20937), (997, 20727), (2303, 8973), (2961, 6979), (2991, 6909)]