20256740

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{257}}^1\times {\mathrm{563}}^1$

素因数の和:836

約数の個数: 48

約数和(自身を含む): 48892032

約数和(自身を除く): 28635292

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 140, 257, 514, 563, 1028, 1126, 1285, 1799, 2252, 2570, 2815, 3598, 3941, 5140, 5630, 7196, 7882, 8995, 11260, 15764, 17990, 19705, 35980, 39410, 78820, 144691, 289382, 578764, 723455, 1012837, 1446910, 2025674, 2893820, 4051348, 5064185, 10128370, 20256740]

約数ペア:

[(1, 20256740), (2, 10128370), (4, 5064185), (5, 4051348), (7, 2893820), (10, 2025674), (14, 1446910), (20, 1012837), (28, 723455), (35, 578764), (70, 289382), (140, 144691), (257, 78820), (514, 39410), (563, 35980), (1028, 19705), (1126, 17990), (1285, 15764), (1799, 11260), (2252, 8995), (2570, 7882), (2815, 7196), (3598, 5630), (3941, 5140)]