21071421

素因数分解:

$3^4\times 7^2\times {\mathrm{5309}}^1$

素因数の和:5335

約数の個数: 30

約数和(自身を含む): 36623070

約数和(自身を除く): 15551649

約数列:

[1, 3, 7, 9, 21, 27, 49, 63, 81, 147, 189, 441, 567, 1323, 3969, 5309, 15927, 37163, 47781, 111489, 143343, 260141, 334467, 430029, 780423, 1003401, 2341269, 3010203, 7023807, 21071421]

約数ペア:

[(1, 21071421), (3, 7023807), (7, 3010203), (9, 2341269), (21, 1003401), (27, 780423), (49, 430029), (63, 334467), (81, 260141), (147, 143343), (189, 111489), (441, 47781), (567, 37163), (1323, 15927), (3969, 5309)]