21005663

素因数分解:

$7^3\times {\mathrm{47}}^1\times {\mathrm{1303}}^1$

素因数の和:1371

約数の個数: 16

約数和(自身を含む): 25036800

約数和(自身を除く): 4031137

約数列:

[1, 7, 47, 49, 329, 343, 1303, 2303, 9121, 16121, 61241, 63847, 428687, 446929, 3000809, 21005663]

約数ペア:

[(1, 21005663), (7, 3000809), (47, 446929), (49, 428687), (329, 63847), (343, 61241), (1303, 16121), (2303, 9121)]