21269780

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{139}}^1\times {\mathrm{1093}}^1$

素因数の和:1248

約数の個数: 48

約数和(自身を含む): 51461760

約数和(自身を除く): 30191980

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 139, 140, 278, 556, 695, 973, 1093, 1390, 1946, 2186, 2780, 3892, 4372, 4865, 5465, 7651, 9730, 10930, 15302, 19460, 21860, 30604, 38255, 76510, 151927, 153020, 303854, 607708, 759635, 1063489, 1519270, 2126978, 3038540, 4253956, 5317445, 10634890, 21269780]

約数ペア:

[(1, 21269780), (2, 10634890), (4, 5317445), (5, 4253956), (7, 3038540), (10, 2126978), (14, 1519270), (20, 1063489), (28, 759635), (35, 607708), (70, 303854), (139, 153020), (140, 151927), (278, 76510), (556, 38255), (695, 30604), (973, 21860), (1093, 19460), (1390, 15302), (1946, 10930), (2186, 9730), (2780, 7651), (3892, 5465), (4372, 4865)]