21780405

素因数分解:

$3^2\times 5^1\times {\mathrm{521}}^1\times {\mathrm{929}}^1$

素因数の和:1461

約数の個数: 24

約数和(自身を含む): 37865880

約数和(自身を除く): 16085475

約数列:

[1, 3, 5, 9, 15, 45, 521, 929, 1563, 2605, 2787, 4645, 4689, 7815, 8361, 13935, 23445, 41805, 484009, 1452027, 2420045, 4356081, 7260135, 21780405]

約数ペア:

[(1, 21780405), (3, 7260135), (5, 4356081), (9, 2420045), (15, 1452027), (45, 484009), (521, 41805), (929, 23445), (1563, 13935), (2605, 8361), (2787, 7815), (4645, 4689)]