642357

素因数分解:

$3^3\times {\mathrm{37}}^1\times {\mathrm{643}}^1$

素因数の和:689

約数の個数: 16

約数和(自身を含む): 978880

約数和(自身を除く): 336523

約数列:

[1, 3, 9, 27, 37, 111, 333, 643, 999, 1929, 5787, 17361, 23791, 71373, 214119, 642357]

約数ペア:

[(1, 642357), (3, 214119), (9, 71373), (27, 23791), (37, 17361), (111, 5787), (333, 1929), (643, 999)]