21742540

素因数分解:

$2^2\times 5^1\times {\mathrm{991}}^1\times {\mathrm{1097}}^1$

素因数の和:2097

約数の個数: 24

約数和(自身を含む): 45747072

約数和(自身を除く): 24004532

約数列:

[1, 2, 4, 5, 10, 20, 991, 1097, 1982, 2194, 3964, 4388, 4955, 5485, 9910, 10970, 19820, 21940, 1087127, 2174254, 4348508, 5435635, 10871270, 21742540]

約数ペア:

[(1, 21742540), (2, 10871270), (4, 5435635), (5, 4348508), (10, 2174254), (20, 1087127), (991, 21940), (1097, 19820), (1982, 10970), (2194, 9910), (3964, 5485), (4388, 4955)]