21945

素因数分解:

$3^1\times 5^1\times 7^1\times {\mathrm{11}}^1\times {\mathrm{19}}^1$

素因数の和:45

約数の個数: 32

約数和(自身を含む): 46080

約数和(自身を除く): 24135

約数列:

[1, 3, 5, 7, 11, 15, 19, 21, 33, 35, 55, 57, 77, 95, 105, 133, 165, 209, 231, 285, 385, 399, 627, 665, 1045, 1155, 1463, 1995, 3135, 4389, 7315, 21945]

約数ペア:

[(1, 21945), (3, 7315), (5, 4389), (7, 3135), (11, 1995), (15, 1463), (19, 1155), (21, 1045), (33, 665), (35, 627), (55, 399), (57, 385), (77, 285), (95, 231), (105, 209), (133, 165)]