21245440

素因数分解:

$2^9\times 5^1\times {\mathrm{43}}^1\times {\mathrm{193}}^1$

素因数の和:259

約数の個数: 80

約数和(自身を含む): 52393968

約数和(自身を除く): 31148528

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 43, 64, 80, 86, 128, 160, 172, 193, 215, 256, 320, 344, 386, 430, 512, 640, 688, 772, 860, 965, 1280, 1376, 1544, 1720, 1930, 2560, 2752, 3088, 3440, 3860, 5504, 6176, 6880, 7720, 8299, 11008, 12352, 13760, 15440, 16598, 22016, 24704, 27520, 30880, 33196, 41495, 49408, 55040, 61760, 66392, 82990, 98816, 110080, 123520, 132784, 165980, 247040, 265568, 331960, 494080, 531136, 663920, 1062272, 1327840, 2124544, 2655680, 4249088, 5311360, 10622720, 21245440]

約数ペア:

[(1, 21245440), (2, 10622720), (4, 5311360), (5, 4249088), (8, 2655680), (10, 2124544), (16, 1327840), (20, 1062272), (32, 663920), (40, 531136), (43, 494080), (64, 331960), (80, 265568), (86, 247040), (128, 165980), (160, 132784), (172, 123520), (193, 110080), (215, 98816), (256, 82990), (320, 66392), (344, 61760), (386, 55040), (430, 49408), (512, 41495), (640, 33196), (688, 30880), (772, 27520), (860, 24704), (965, 22016), (1280, 16598), (1376, 15440), (1544, 13760), (1720, 12352), (1930, 11008), (2560, 8299), (2752, 7720), (3088, 6880), (3440, 6176), (3860, 5504)]