20857144

素因数分解:

$2^3\times 7^3\times {\mathrm{11}}^1\times {\mathrm{691}}^1$

素因数の和:729

約数の個数: 64

約数和(自身を含む): 49824000

約数和(自身を除く): 28966856

約数列:

[1, 2, 4, 7, 8, 11, 14, 22, 28, 44, 49, 56, 77, 88, 98, 154, 196, 308, 343, 392, 539, 616, 686, 691, 1078, 1372, 1382, 2156, 2744, 2764, 3773, 4312, 4837, 5528, 7546, 7601, 9674, 15092, 15202, 19348, 30184, 30404, 33859, 38696, 53207, 60808, 67718, 106414, 135436, 212828, 237013, 270872, 372449, 425656, 474026, 744898, 948052, 1489796, 1896104, 2607143, 2979592, 5214286, 10428572, 20857144]

約数ペア:

[(1, 20857144), (2, 10428572), (4, 5214286), (7, 2979592), (8, 2607143), (11, 1896104), (14, 1489796), (22, 948052), (28, 744898), (44, 474026), (49, 425656), (56, 372449), (77, 270872), (88, 237013), (98, 212828), (154, 135436), (196, 106414), (308, 67718), (343, 60808), (392, 53207), (539, 38696), (616, 33859), (686, 30404), (691, 30184), (1078, 19348), (1372, 15202), (1382, 15092), (2156, 9674), (2744, 7601), (2764, 7546), (3773, 5528), (4312, 4837)]