21057920

素因数分解:

$2^7\times 5^1\times {\mathrm{13}}^1\times {\mathrm{2531}}^1$

素因数の和:2563

約数の個数: 64

約数和(自身を含む): 54235440

約数和(自身を除く): 33177520

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 32, 40, 52, 64, 65, 80, 104, 128, 130, 160, 208, 260, 320, 416, 520, 640, 832, 1040, 1664, 2080, 2531, 4160, 5062, 8320, 10124, 12655, 20248, 25310, 32903, 40496, 50620, 65806, 80992, 101240, 131612, 161984, 164515, 202480, 263224, 323968, 329030, 404960, 526448, 658060, 809920, 1052896, 1316120, 1619840, 2105792, 2632240, 4211584, 5264480, 10528960, 21057920]

約数ペア:

[(1, 21057920), (2, 10528960), (4, 5264480), (5, 4211584), (8, 2632240), (10, 2105792), (13, 1619840), (16, 1316120), (20, 1052896), (26, 809920), (32, 658060), (40, 526448), (52, 404960), (64, 329030), (65, 323968), (80, 263224), (104, 202480), (128, 164515), (130, 161984), (160, 131612), (208, 101240), (260, 80992), (320, 65806), (416, 50620), (520, 40496), (640, 32903), (832, 25310), (1040, 20248), (1664, 12655), (2080, 10124), (2531, 8320), (4160, 5062)]