21085281

素因数分解:

$3^2\times 7^1\times {\mathrm{47}}^1\times {\mathrm{7121}}^1$

素因数の和:7181

約数の個数: 24

約数和(自身を含む): 35553024

約数和(自身を除く): 14467743

約数列:

[1, 3, 7, 9, 21, 47, 63, 141, 329, 423, 987, 2961, 7121, 21363, 49847, 64089, 149541, 334687, 448623, 1004061, 2342809, 3012183, 7028427, 21085281]

約数ペア:

[(1, 21085281), (3, 7028427), (7, 3012183), (9, 2342809), (21, 1004061), (47, 448623), (63, 334687), (141, 149541), (329, 64089), (423, 49847), (987, 21363), (2961, 7121)]