21128513

素因数分解:

$7^1\times {\mathrm{19}}^1\times {\mathrm{23}}^1\times {\mathrm{6907}}^1$

素因数の和:6956

約数の個数: 16

約数和(自身を含む): 26526720

約数和(自身を除く): 5398207

約数列:

[1, 7, 19, 23, 133, 161, 437, 3059, 6907, 48349, 131233, 158861, 918631, 1112027, 3018359, 21128513]

約数ペア:

[(1, 21128513), (7, 3018359), (19, 1112027), (23, 918631), (133, 158861), (161, 131233), (437, 48349), (3059, 6907)]