21305805

素因数分解:

$3^1\times 5^1\times {\mathrm{47}}^2\times {\mathrm{643}}^1$

素因数の和:745

約数の個数: 24

約数和(自身を含む): 34884192

約数和(自身を除く): 13578387

約数列:

[1, 3, 5, 15, 47, 141, 235, 643, 705, 1929, 2209, 3215, 6627, 9645, 11045, 30221, 33135, 90663, 151105, 453315, 1420387, 4261161, 7101935, 21305805]

約数ペア:

[(1, 21305805), (3, 7101935), (5, 4261161), (15, 1420387), (47, 453315), (141, 151105), (235, 90663), (643, 33135), (705, 30221), (1929, 11045), (2209, 9645), (3215, 6627)]