21216559

素因数分解:

$7^2\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{1753}}^1$

素因数の和:1799

約数の個数: 24

約数和(自身を含む): 27993840

約数和(自身を除く): 6777281

約数列:

[1, 7, 13, 19, 49, 91, 133, 247, 637, 931, 1729, 1753, 12103, 12271, 22789, 33307, 85897, 159523, 233149, 432991, 1116661, 1632043, 3030937, 21216559]

約数ペア:

[(1, 21216559), (7, 3030937), (13, 1632043), (19, 1116661), (49, 432991), (91, 233149), (133, 159523), (247, 85897), (637, 33307), (931, 22789), (1729, 12271), (1753, 12103)]