21181581

素因数分解:

$3^5\times {\mathrm{67}}^1\times {\mathrm{1301}}^1$

素因数の和:1383

約数の個数: 24

約数和(自身を含む): 32227104

約数和(自身を除く): 11045523

約数列:

[1, 3, 9, 27, 67, 81, 201, 243, 603, 1301, 1809, 3903, 5427, 11709, 16281, 35127, 87167, 105381, 261501, 316143, 784503, 2353509, 7060527, 21181581]

約数ペア:

[(1, 21181581), (3, 7060527), (9, 2353509), (27, 784503), (67, 316143), (81, 261501), (201, 105381), (243, 87167), (603, 35127), (1301, 16281), (1809, 11709), (3903, 5427)]