21809655

素因数分解:

$3^4\times 5^1\times 7^3\times {\mathrm{157}}^1$

素因数の和:195

約数の個数: 80

約数和(自身を含む): 45883200

約数和(自身を除く): 24073545

約数列:

[1, 3, 5, 7, 9, 15, 21, 27, 35, 45, 49, 63, 81, 105, 135, 147, 157, 189, 245, 315, 343, 405, 441, 471, 567, 735, 785, 945, 1029, 1099, 1323, 1413, 1715, 2205, 2355, 2835, 3087, 3297, 3969, 4239, 5145, 5495, 6615, 7065, 7693, 9261, 9891, 12717, 15435, 16485, 19845, 21195, 23079, 27783, 29673, 38465, 46305, 49455, 53851, 63585, 69237, 89019, 115395, 138915, 148365, 161553, 207711, 269255, 346185, 445095, 484659, 623133, 807765, 1038555, 1453977, 2423295, 3115665, 4361931, 7269885, 21809655]

約数ペア:

[(1, 21809655), (3, 7269885), (5, 4361931), (7, 3115665), (9, 2423295), (15, 1453977), (21, 1038555), (27, 807765), (35, 623133), (45, 484659), (49, 445095), (63, 346185), (81, 269255), (105, 207711), (135, 161553), (147, 148365), (157, 138915), (189, 115395), (245, 89019), (315, 69237), (343, 63585), (405, 53851), (441, 49455), (471, 46305), (567, 38465), (735, 29673), (785, 27783), (945, 23079), (1029, 21195), (1099, 19845), (1323, 16485), (1413, 15435), (1715, 12717), (2205, 9891), (2355, 9261), (2835, 7693), (3087, 7065), (3297, 6615), (3969, 5495), (4239, 5145)]