18978141

素因数分解:

$3^1\times 7^2\times {\mathrm{13}}^1\times {\mathrm{9931}}^1$

素因数の和:9961

約数の個数: 24

約数和(自身を含む): 31702944

約数和(自身を除く): 12724803

約数列:

[1, 3, 7, 13, 21, 39, 49, 91, 147, 273, 637, 1911, 9931, 29793, 69517, 129103, 208551, 387309, 486619, 903721, 1459857, 2711163, 6326047, 18978141]

約数ペア:

[(1, 18978141), (3, 6326047), (7, 2711163), (13, 1459857), (21, 903721), (39, 486619), (49, 387309), (91, 208551), (147, 129103), (273, 69517), (637, 29793), (1911, 9931)]