21358045

素因数分解:

$5^1\times {\mathrm{79}}^1\times {\mathrm{139}}^1\times {\mathrm{389}}^1$

素因数の和:612

約数の個数: 16

約数和(自身を含む): 26208000

約数和(自身を除く): 4849955

約数列:

[1, 5, 79, 139, 389, 395, 695, 1945, 10981, 30731, 54071, 54905, 153655, 270355, 4271609, 21358045]

約数ペア:

[(1, 21358045), (5, 4271609), (79, 270355), (139, 153655), (389, 54905), (395, 54071), (695, 30731), (1945, 10981)]