21143871

素因数分解:

$3^2\times 7^1\times {\mathrm{29}}^1\times {\mathrm{71}}^1\times {\mathrm{163}}^1$

素因数の和:276

約数の個数: 48

約数和(自身を含む): 36840960

約数和(自身を除く): 15697089

約数列:

[1, 3, 7, 9, 21, 29, 63, 71, 87, 163, 203, 213, 261, 489, 497, 609, 639, 1141, 1467, 1491, 1827, 2059, 3423, 4473, 4727, 6177, 10269, 11573, 14181, 14413, 18531, 33089, 34719, 42543, 43239, 81011, 99267, 104157, 129717, 243033, 297801, 335617, 729099, 1006851, 2349319, 3020553, 7047957, 21143871]

約数ペア:

[(1, 21143871), (3, 7047957), (7, 3020553), (9, 2349319), (21, 1006851), (29, 729099), (63, 335617), (71, 297801), (87, 243033), (163, 129717), (203, 104157), (213, 99267), (261, 81011), (489, 43239), (497, 42543), (609, 34719), (639, 33089), (1141, 18531), (1467, 14413), (1491, 14181), (1827, 11573), (2059, 10269), (3423, 6177), (4473, 4727)]