21721155

素因数分解:

$3^1\times 5^1\times {\mathrm{17}}^1\times {\mathrm{103}}^1\times {\mathrm{827}}^1$

素因数の和:955

約数の個数: 32

約数和(自身を含む): 37200384

約数和(自身を除く): 15479229

約数列:

[1, 3, 5, 15, 17, 51, 85, 103, 255, 309, 515, 827, 1545, 1751, 2481, 4135, 5253, 8755, 12405, 14059, 26265, 42177, 70295, 85181, 210885, 255543, 425905, 1277715, 1448077, 4344231, 7240385, 21721155]

約数ペア:

[(1, 21721155), (3, 7240385), (5, 4344231), (15, 1448077), (17, 1277715), (51, 425905), (85, 255543), (103, 210885), (255, 85181), (309, 70295), (515, 42177), (827, 26265), (1545, 14059), (1751, 12405), (2481, 8755), (4135, 5253)]