21505805

素因数分解:

$5^1\times {\mathrm{23}}^1\times {\mathrm{43}}^1\times {\mathrm{4349}}^1$

素因数の和:4420

約数の個数: 16

約数和(自身を含む): 27561600

約数和(自身を除く): 6055795

約数列:

[1, 5, 23, 43, 115, 215, 989, 4349, 4945, 21745, 100027, 187007, 500135, 935035, 4301161, 21505805]

約数ペア:

[(1, 21505805), (5, 4301161), (23, 935035), (43, 500135), (115, 187007), (215, 100027), (989, 21745), (4349, 4945)]