21506139

素因数分解:

$3^2\times {\mathrm{17}}^1\times {\mathrm{29}}^1\times {\mathrm{37}}^1\times {\mathrm{131}}^1$

素因数の和:220

約数の個数: 48

約数和(自身を含む): 35212320

約数和(自身を除く): 13706181

約数列:

[1, 3, 9, 17, 29, 37, 51, 87, 111, 131, 153, 261, 333, 393, 493, 629, 1073, 1179, 1479, 1887, 2227, 3219, 3799, 4437, 4847, 5661, 6681, 9657, 11397, 14541, 18241, 20043, 34191, 43623, 54723, 64583, 82399, 140563, 164169, 193749, 247197, 421689, 581247, 741591, 1265067, 2389571, 7168713, 21506139]

約数ペア:

[(1, 21506139), (3, 7168713), (9, 2389571), (17, 1265067), (29, 741591), (37, 581247), (51, 421689), (87, 247197), (111, 193749), (131, 164169), (153, 140563), (261, 82399), (333, 64583), (393, 54723), (493, 43623), (629, 34191), (1073, 20043), (1179, 18241), (1479, 14541), (1887, 11397), (2227, 9657), (3219, 6681), (3799, 5661), (4437, 4847)]