21309561

素因数分解:

$3^4\times 7^3\times {\mathrm{13}}^1\times {\mathrm{59}}^1$

素因数の和:105

約数の個数: 80

約数和(自身を含む): 40656000

約数和(自身を除く): 19346439

約数列:

[1, 3, 7, 9, 13, 21, 27, 39, 49, 59, 63, 81, 91, 117, 147, 177, 189, 273, 343, 351, 413, 441, 531, 567, 637, 767, 819, 1029, 1053, 1239, 1323, 1593, 1911, 2301, 2457, 2891, 3087, 3717, 3969, 4459, 4779, 5369, 5733, 6903, 7371, 8673, 9261, 11151, 13377, 16107, 17199, 20237, 20709, 26019, 27783, 33453, 37583, 40131, 48321, 51597, 60711, 62127, 78057, 112749, 120393, 144963, 182133, 234171, 263081, 338247, 361179, 434889, 546399, 789243, 1014741, 1639197, 2367729, 3044223, 7103187, 21309561]

約数ペア:

[(1, 21309561), (3, 7103187), (7, 3044223), (9, 2367729), (13, 1639197), (21, 1014741), (27, 789243), (39, 546399), (49, 434889), (59, 361179), (63, 338247), (81, 263081), (91, 234171), (117, 182133), (147, 144963), (177, 120393), (189, 112749), (273, 78057), (343, 62127), (351, 60711), (413, 51597), (441, 48321), (531, 40131), (567, 37583), (637, 33453), (767, 27783), (819, 26019), (1029, 20709), (1053, 20237), (1239, 17199), (1323, 16107), (1593, 13377), (1911, 11151), (2301, 9261), (2457, 8673), (2891, 7371), (3087, 6903), (3717, 5733), (3969, 5369), (4459, 4779)]