21119920

素因数分解:

$2^4\times 5^1\times {\mathrm{41}}^1\times {\mathrm{47}}^1\times {\mathrm{137}}^1$

素因数の和:238

約数の個数: 80

約数和(自身を含む): 51746688

約数和(自身を除く): 30626768

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 41, 47, 80, 82, 94, 137, 164, 188, 205, 235, 274, 328, 376, 410, 470, 548, 656, 685, 752, 820, 940, 1096, 1370, 1640, 1880, 1927, 2192, 2740, 3280, 3760, 3854, 5480, 5617, 6439, 7708, 9635, 10960, 11234, 12878, 15416, 19270, 22468, 25756, 28085, 30832, 32195, 38540, 44936, 51512, 56170, 64390, 77080, 89872, 103024, 112340, 128780, 154160, 224680, 257560, 263999, 449360, 515120, 527998, 1055996, 1319995, 2111992, 2639990, 4223984, 5279980, 10559960, 21119920]

約数ペア:

[(1, 21119920), (2, 10559960), (4, 5279980), (5, 4223984), (8, 2639990), (10, 2111992), (16, 1319995), (20, 1055996), (40, 527998), (41, 515120), (47, 449360), (80, 263999), (82, 257560), (94, 224680), (137, 154160), (164, 128780), (188, 112340), (205, 103024), (235, 89872), (274, 77080), (328, 64390), (376, 56170), (410, 51512), (470, 44936), (548, 38540), (656, 32195), (685, 30832), (752, 28085), (820, 25756), (940, 22468), (1096, 19270), (1370, 15416), (1640, 12878), (1880, 11234), (1927, 10960), (2192, 9635), (2740, 7708), (3280, 6439), (3760, 5617), (3854, 5480)]