21480081

素因数分解:

$3^1\times 7^2\times {\mathrm{47}}^1\times {\mathrm{3109}}^1$

素因数の和:3173

約数の個数: 24

約数和(自身を含む): 34035840

約数和(自身を除く): 12555759

約数列:

[1, 3, 7, 21, 47, 49, 141, 147, 329, 987, 2303, 3109, 6909, 9327, 21763, 65289, 146123, 152341, 438369, 457023, 1022861, 3068583, 7160027, 21480081]

約数ペア:

[(1, 21480081), (3, 7160027), (7, 3068583), (21, 1022861), (47, 457023), (49, 438369), (141, 152341), (147, 146123), (329, 65289), (987, 21763), (2303, 9327), (3109, 6909)]