21078183

素因数分解:

$3^1\times 7^2\times {\mathrm{223}}^1\times {\mathrm{643}}^1$

素因数の和:883

約数の個数: 24

約数和(自身を含む): 32890368

約数和(自身を除く): 11812185

約数列:

[1, 3, 7, 21, 49, 147, 223, 643, 669, 1561, 1929, 4501, 4683, 10927, 13503, 31507, 32781, 94521, 143389, 430167, 1003723, 3011169, 7026061, 21078183]

約数ペア:

[(1, 21078183), (3, 7026061), (7, 3011169), (21, 1003723), (49, 430167), (147, 143389), (223, 94521), (643, 32781), (669, 31507), (1561, 13503), (1929, 10927), (4501, 4683)]