20987505

素因数分解:

$3^4\times 5^1\times 7^1\times {\mathrm{11}}^1\times {\mathrm{673}}^1$

素因数の和:708

約数の個数: 80

約数和(自身を含む): 46975104

約数和(自身を除く): 25987599

約数列:

[1, 3, 5, 7, 9, 11, 15, 21, 27, 33, 35, 45, 55, 63, 77, 81, 99, 105, 135, 165, 189, 231, 297, 315, 385, 405, 495, 567, 673, 693, 891, 945, 1155, 1485, 2019, 2079, 2835, 3365, 3465, 4455, 4711, 6057, 6237, 7403, 10095, 10395, 14133, 18171, 22209, 23555, 30285, 31185, 37015, 42399, 51821, 54513, 66627, 70665, 90855, 111045, 127197, 155463, 199881, 211995, 259105, 272565, 333135, 381591, 466389, 599643, 635985, 777315, 999405, 1399167, 1907955, 2331945, 2998215, 4197501, 6995835, 20987505]

約数ペア:

[(1, 20987505), (3, 6995835), (5, 4197501), (7, 2998215), (9, 2331945), (11, 1907955), (15, 1399167), (21, 999405), (27, 777315), (33, 635985), (35, 599643), (45, 466389), (55, 381591), (63, 333135), (77, 272565), (81, 259105), (99, 211995), (105, 199881), (135, 155463), (165, 127197), (189, 111045), (231, 90855), (297, 70665), (315, 66627), (385, 54513), (405, 51821), (495, 42399), (567, 37015), (673, 31185), (693, 30285), (891, 23555), (945, 22209), (1155, 18171), (1485, 14133), (2019, 10395), (2079, 10095), (2835, 7403), (3365, 6237), (3465, 6057), (4455, 4711)]