20904135

素因数分解:

$3^1\times 5^1\times 7^3\times {\mathrm{17}}^1\times {\mathrm{239}}^1$

素因数の和:285

約数の個数: 64

約数和(自身を含む): 41472000

約数和(自身を除く): 20567865

約数列:

[1, 3, 5, 7, 15, 17, 21, 35, 49, 51, 85, 105, 119, 147, 239, 245, 255, 343, 357, 595, 717, 735, 833, 1029, 1195, 1673, 1715, 1785, 2499, 3585, 4063, 4165, 5019, 5145, 5831, 8365, 11711, 12189, 12495, 17493, 20315, 25095, 28441, 29155, 35133, 58555, 60945, 81977, 85323, 87465, 142205, 175665, 199087, 245931, 409885, 426615, 597261, 995435, 1229655, 1393609, 2986305, 4180827, 6968045, 20904135]

約数ペア:

[(1, 20904135), (3, 6968045), (5, 4180827), (7, 2986305), (15, 1393609), (17, 1229655), (21, 995435), (35, 597261), (49, 426615), (51, 409885), (85, 245931), (105, 199087), (119, 175665), (147, 142205), (239, 87465), (245, 85323), (255, 81977), (343, 60945), (357, 58555), (595, 35133), (717, 29155), (735, 28441), (833, 25095), (1029, 20315), (1195, 17493), (1673, 12495), (1715, 12189), (1785, 11711), (2499, 8365), (3585, 5831), (4063, 5145), (4165, 5019)]