21581055

素因数分解:

$3^2\times 5^1\times {\mathrm{19}}^1\times {\mathrm{43}}^1\times {\mathrm{587}}^1$

素因数の和:660

約数の個数: 48

約数和(自身を含む): 40360320

約数和(自身を除く): 18779265

約数列:

[1, 3, 5, 9, 15, 19, 43, 45, 57, 95, 129, 171, 215, 285, 387, 587, 645, 817, 855, 1761, 1935, 2451, 2935, 4085, 5283, 7353, 8805, 11153, 12255, 25241, 26415, 33459, 36765, 55765, 75723, 100377, 126205, 167295, 227169, 378615, 479579, 501885, 1135845, 1438737, 2397895, 4316211, 7193685, 21581055]

約数ペア:

[(1, 21581055), (3, 7193685), (5, 4316211), (9, 2397895), (15, 1438737), (19, 1135845), (43, 501885), (45, 479579), (57, 378615), (95, 227169), (129, 167295), (171, 126205), (215, 100377), (285, 75723), (387, 55765), (587, 36765), (645, 33459), (817, 26415), (855, 25241), (1761, 12255), (1935, 11153), (2451, 8805), (2935, 7353), (4085, 5283)]