20915853

素因数分解:

$3^1\times 7^1\times {\mathrm{131}}^1\times {\mathrm{7603}}^1$

素因数の和:7744

約数の個数: 16

約数和(自身を含む): 32119296

約数和(自身を除く): 11203443

約数列:

[1, 3, 7, 21, 131, 393, 917, 2751, 7603, 22809, 53221, 159663, 995993, 2987979, 6971951, 20915853]

約数ペア:

[(1, 20915853), (3, 6971951), (7, 2987979), (21, 995993), (131, 159663), (393, 53221), (917, 22809), (2751, 7603)]