661689

素因数分解:

$3^5\times 7^1\times {\mathrm{389}}^1$

素因数の和:411

約数の個数: 24

約数和(自身を含む): 1135680

約数和(自身を除く): 473991

約数列:

[1, 3, 7, 9, 21, 27, 63, 81, 189, 243, 389, 567, 1167, 1701, 2723, 3501, 8169, 10503, 24507, 31509, 73521, 94527, 220563, 661689]

約数ペア:

[(1, 661689), (3, 220563), (7, 94527), (9, 73521), (21, 31509), (27, 24507), (63, 10503), (81, 8169), (189, 3501), (243, 2723), (389, 1701), (567, 1167)]