20729205

素因数分解:

$3^2\times 5^1\times 7^3\times {\mathrm{17}}^1\times {\mathrm{79}}^1$

素因数の和:128

約数の個数: 96

約数和(自身を含む): 44928000

約数和(自身を除く): 24198795

約数列:

[1, 3, 5, 7, 9, 15, 17, 21, 35, 45, 49, 51, 63, 79, 85, 105, 119, 147, 153, 237, 245, 255, 315, 343, 357, 395, 441, 553, 595, 711, 735, 765, 833, 1029, 1071, 1185, 1343, 1659, 1715, 1785, 2205, 2499, 2765, 3087, 3555, 3871, 4029, 4165, 4977, 5145, 5355, 5831, 6715, 7497, 8295, 9401, 11613, 12087, 12495, 15435, 17493, 19355, 20145, 24885, 27097, 28203, 29155, 34839, 37485, 47005, 52479, 58065, 60435, 65807, 81291, 84609, 87465, 135485, 141015, 174195, 197421, 243873, 262395, 329035, 406455, 423045, 460649, 592263, 987105, 1219365, 1381947, 2303245, 2961315, 4145841, 6909735, 20729205]

約数ペア:

[(1, 20729205), (3, 6909735), (5, 4145841), (7, 2961315), (9, 2303245), (15, 1381947), (17, 1219365), (21, 987105), (35, 592263), (45, 460649), (49, 423045), (51, 406455), (63, 329035), (79, 262395), (85, 243873), (105, 197421), (119, 174195), (147, 141015), (153, 135485), (237, 87465), (245, 84609), (255, 81291), (315, 65807), (343, 60435), (357, 58065), (395, 52479), (441, 47005), (553, 37485), (595, 34839), (711, 29155), (735, 28203), (765, 27097), (833, 24885), (1029, 20145), (1071, 19355), (1185, 17493), (1343, 15435), (1659, 12495), (1715, 12087), (1785, 11613), (2205, 9401), (2499, 8295), (2765, 7497), (3087, 6715), (3555, 5831), (3871, 5355), (4029, 5145), (4165, 4977)]