21651721

素因数分解:

$7^1\times {\mathrm{13}}^1\times {\mathrm{229}}^1\times {\mathrm{1039}}^1$

素因数の和:1288

約数の個数: 16

約数和(自身を含む): 26790400

約数和(自身を除く): 5138679

約数列:

[1, 7, 13, 91, 229, 1039, 1603, 2977, 7273, 13507, 20839, 94549, 237931, 1665517, 3093103, 21651721]

約数ペア:

[(1, 21651721), (7, 3093103), (13, 1665517), (91, 237931), (229, 94549), (1039, 20839), (1603, 13507), (2977, 7273)]