21388918

素因数分解:

$2^1\times {\mathrm{61}}^1\times {\mathrm{199}}^1\times {\mathrm{881}}^1$

素因数の和:1143

約数の個数: 16

約数和(自身を含む): 32810400

約数和(自身を除く): 11421482

約数列:

[1, 2, 61, 122, 199, 398, 881, 1762, 12139, 24278, 53741, 107482, 175319, 350638, 10694459, 21388918]

約数ペア:

[(1, 21388918), (2, 10694459), (61, 350638), (122, 175319), (199, 107482), (398, 53741), (881, 24278), (1762, 12139)]