256540

素因数分解:

$2^2\times 5^1\times {\mathrm{101}}^1\times {\mathrm{127}}^1$

素因数の和:237

約数の個数: 24

約数和(自身を含む): 548352

約数和(自身を除く): 291812

約数列:

[1, 2, 4, 5, 10, 20, 101, 127, 202, 254, 404, 505, 508, 635, 1010, 1270, 2020, 2540, 12827, 25654, 51308, 64135, 128270, 256540]

約数ペア:

[(1, 256540), (2, 128270), (4, 64135), (5, 51308), (10, 25654), (20, 12827), (101, 2540), (127, 2020), (202, 1270), (254, 1010), (404, 635), (505, 508)]