20640340

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{379}}^1\times {\mathrm{389}}^1$

素因数の和:784

約数の個数: 48

約数和(自身を含む): 49795200

約数和(自身を除く): 29154860

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 140, 379, 389, 758, 778, 1516, 1556, 1895, 1945, 2653, 2723, 3790, 3890, 5306, 5446, 7580, 7780, 10612, 10892, 13265, 13615, 26530, 27230, 53060, 54460, 147431, 294862, 589724, 737155, 1032017, 1474310, 2064034, 2948620, 4128068, 5160085, 10320170, 20640340]

約数ペア:

[(1, 20640340), (2, 10320170), (4, 5160085), (5, 4128068), (7, 2948620), (10, 2064034), (14, 1474310), (20, 1032017), (28, 737155), (35, 589724), (70, 294862), (140, 147431), (379, 54460), (389, 53060), (758, 27230), (778, 26530), (1516, 13615), (1556, 13265), (1895, 10892), (1945, 10612), (2653, 7780), (2723, 7580), (3790, 5446), (3890, 5306)]