21787605

素因数分解:

$3^2\times 5^1\times 7^2\times {\mathrm{41}}^1\times {\mathrm{241}}^1$

素因数の和:307

約数の個数: 72

約数和(自身を含む): 45189144

約数和(自身を除く): 23401539

約数列:

[1, 3, 5, 7, 9, 15, 21, 35, 41, 45, 49, 63, 105, 123, 147, 205, 241, 245, 287, 315, 369, 441, 615, 723, 735, 861, 1205, 1435, 1687, 1845, 2009, 2169, 2205, 2583, 3615, 4305, 5061, 6027, 8435, 9881, 10045, 10845, 11809, 12915, 15183, 18081, 25305, 29643, 30135, 35427, 49405, 59045, 69167, 75915, 88929, 90405, 106281, 148215, 177135, 207501, 345835, 444645, 484169, 531405, 622503, 1037505, 1452507, 2420845, 3112515, 4357521, 7262535, 21787605]

約数ペア:

[(1, 21787605), (3, 7262535), (5, 4357521), (7, 3112515), (9, 2420845), (15, 1452507), (21, 1037505), (35, 622503), (41, 531405), (45, 484169), (49, 444645), (63, 345835), (105, 207501), (123, 177135), (147, 148215), (205, 106281), (241, 90405), (245, 88929), (287, 75915), (315, 69167), (369, 59045), (441, 49405), (615, 35427), (723, 30135), (735, 29643), (861, 25305), (1205, 18081), (1435, 15183), (1687, 12915), (1845, 11809), (2009, 10845), (2169, 10045), (2205, 9881), (2583, 8435), (3615, 6027), (4305, 5061)]