21392740

素因数分解:

$2^2\times 5^1\times {\mathrm{271}}^1\times {\mathrm{3947}}^1$

素因数の和:4227

約数の個数: 24

約数和(自身を含む): 45101952

約数和(自身を除く): 23709212

約数列:

[1, 2, 4, 5, 10, 20, 271, 542, 1084, 1355, 2710, 3947, 5420, 7894, 15788, 19735, 39470, 78940, 1069637, 2139274, 4278548, 5348185, 10696370, 21392740]

約数ペア:

[(1, 21392740), (2, 10696370), (4, 5348185), (5, 4278548), (10, 2139274), (20, 1069637), (271, 78940), (542, 39470), (1084, 19735), (1355, 15788), (2710, 7894), (3947, 5420)]