20898640

素因数分解:

$2^4\times 5^1\times 7^1\times {\mathrm{67}}^1\times {\mathrm{557}}^1$

素因数の和:644

約数の個数: 80

約数和(自身を含む): 56460672

約数和(自身を除く): 35562032

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 35, 40, 56, 67, 70, 80, 112, 134, 140, 268, 280, 335, 469, 536, 557, 560, 670, 938, 1072, 1114, 1340, 1876, 2228, 2345, 2680, 2785, 3752, 3899, 4456, 4690, 5360, 5570, 7504, 7798, 8912, 9380, 11140, 15596, 18760, 19495, 22280, 31192, 37319, 37520, 38990, 44560, 62384, 74638, 77980, 149276, 155960, 186595, 261233, 298552, 311920, 373190, 522466, 597104, 746380, 1044932, 1306165, 1492760, 2089864, 2612330, 2985520, 4179728, 5224660, 10449320, 20898640]

約数ペア:

[(1, 20898640), (2, 10449320), (4, 5224660), (5, 4179728), (7, 2985520), (8, 2612330), (10, 2089864), (14, 1492760), (16, 1306165), (20, 1044932), (28, 746380), (35, 597104), (40, 522466), (56, 373190), (67, 311920), (70, 298552), (80, 261233), (112, 186595), (134, 155960), (140, 149276), (268, 77980), (280, 74638), (335, 62384), (469, 44560), (536, 38990), (557, 37520), (560, 37319), (670, 31192), (938, 22280), (1072, 19495), (1114, 18760), (1340, 15596), (1876, 11140), (2228, 9380), (2345, 8912), (2680, 7798), (2785, 7504), (3752, 5570), (3899, 5360), (4456, 4690)]