21706240

素因数分解:

$2^9\times 5^1\times {\mathrm{61}}^1\times {\mathrm{139}}^1$

素因数の和:223

約数の個数: 80

約数和(自身を含む): 53277840

約数和(自身を除く): 31571600

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 61, 64, 80, 122, 128, 139, 160, 244, 256, 278, 305, 320, 488, 512, 556, 610, 640, 695, 976, 1112, 1220, 1280, 1390, 1952, 2224, 2440, 2560, 2780, 3904, 4448, 4880, 5560, 7808, 8479, 8896, 9760, 11120, 15616, 16958, 17792, 19520, 22240, 31232, 33916, 35584, 39040, 42395, 44480, 67832, 71168, 78080, 84790, 88960, 135664, 156160, 169580, 177920, 271328, 339160, 355840, 542656, 678320, 1085312, 1356640, 2170624, 2713280, 4341248, 5426560, 10853120, 21706240]

約数ペア:

[(1, 21706240), (2, 10853120), (4, 5426560), (5, 4341248), (8, 2713280), (10, 2170624), (16, 1356640), (20, 1085312), (32, 678320), (40, 542656), (61, 355840), (64, 339160), (80, 271328), (122, 177920), (128, 169580), (139, 156160), (160, 135664), (244, 88960), (256, 84790), (278, 78080), (305, 71168), (320, 67832), (488, 44480), (512, 42395), (556, 39040), (610, 35584), (640, 33916), (695, 31232), (976, 22240), (1112, 19520), (1220, 17792), (1280, 16958), (1390, 15616), (1952, 11120), (2224, 9760), (2440, 8896), (2560, 8479), (2780, 7808), (3904, 5560), (4448, 4880)]