21245733

素因数分解:

$3^5\times {\mathrm{17}}^1\times {\mathrm{37}}^1\times {\mathrm{139}}^1$

素因数の和:208

約数の個数: 48

約数和(自身を含む): 34856640

約数和(自身を除く): 13610907

約数列:

[1, 3, 9, 17, 27, 37, 51, 81, 111, 139, 153, 243, 333, 417, 459, 629, 999, 1251, 1377, 1887, 2363, 2997, 3753, 4131, 5143, 5661, 7089, 8991, 11259, 15429, 16983, 21267, 33777, 46287, 50949, 63801, 87431, 138861, 152847, 191403, 262293, 416583, 574209, 786879, 1249749, 2360637, 7081911, 21245733]

約数ペア:

[(1, 21245733), (3, 7081911), (9, 2360637), (17, 1249749), (27, 786879), (37, 574209), (51, 416583), (81, 262293), (111, 191403), (139, 152847), (153, 138861), (243, 87431), (333, 63801), (417, 50949), (459, 46287), (629, 33777), (999, 21267), (1251, 16983), (1377, 15429), (1887, 11259), (2363, 8991), (2997, 7089), (3753, 5661), (4131, 5143)]