21250173

素因数分解:

$3^1\times 7^2\times {\mathrm{37}}^1\times {\mathrm{3907}}^1$

素因数の和:3961

約数の個数: 24

約数和(自身を含む): 33858912

約数和(自身を除く): 12608739

約数列:

[1, 3, 7, 21, 37, 49, 111, 147, 259, 777, 1813, 3907, 5439, 11721, 27349, 82047, 144559, 191443, 433677, 574329, 1011913, 3035739, 7083391, 21250173]

約数ペア:

[(1, 21250173), (3, 7083391), (7, 3035739), (21, 1011913), (37, 574329), (49, 433677), (111, 191443), (147, 144559), (259, 82047), (777, 27349), (1813, 11721), (3907, 5439)]