21091880

素因数分解:

$2^3\times 5^1\times {\mathrm{53}}^1\times {\mathrm{9949}}^1$

素因数の和:10013

約数の個数: 32

約数和(自身を含む): 48357000

約数和(自身を除く): 27265120

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 53, 106, 212, 265, 424, 530, 1060, 2120, 9949, 19898, 39796, 49745, 79592, 99490, 198980, 397960, 527297, 1054594, 2109188, 2636485, 4218376, 5272970, 10545940, 21091880]

約数ペア:

[(1, 21091880), (2, 10545940), (4, 5272970), (5, 4218376), (8, 2636485), (10, 2109188), (20, 1054594), (40, 527297), (53, 397960), (106, 198980), (212, 99490), (265, 79592), (424, 49745), (530, 39796), (1060, 19898), (2120, 9949)]