21700679

素因数分解:

$7^2\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{163}}^1$

素因数の和:220

約数の個数: 48

約数和(自身を含む): 31409280

約数和(自身を除く): 9708601

約数列:

[1, 7, 11, 13, 19, 49, 77, 91, 133, 143, 163, 209, 247, 539, 637, 931, 1001, 1141, 1463, 1729, 1793, 2119, 2717, 3097, 7007, 7987, 10241, 12103, 12551, 14833, 19019, 21679, 23309, 34067, 40261, 87857, 103831, 133133, 151753, 163163, 238469, 281827, 442871, 1142141, 1669283, 1972789, 3100097, 21700679]

約数ペア:

[(1, 21700679), (7, 3100097), (11, 1972789), (13, 1669283), (19, 1142141), (49, 442871), (77, 281827), (91, 238469), (133, 163163), (143, 151753), (163, 133133), (209, 103831), (247, 87857), (539, 40261), (637, 34067), (931, 23309), (1001, 21679), (1141, 19019), (1463, 14833), (1729, 12551), (1793, 12103), (2119, 10241), (2717, 7987), (3097, 7007)]