19998976

素因数分解:

$2^8\times {\mathrm{78121}}^1$

素因数の和:78137

約数の個数: 18

約数和(自身を含む): 39920342

約数和(自身を除く): 19921366

約数列:

[1, 2, 4, 8, 16, 32, 64, 128, 256, 78121, 156242, 312484, 624968, 1249936, 2499872, 4999744, 9999488, 19998976]

約数ペア:

[(1, 19998976), (2, 9999488), (4, 4999744), (8, 2499872), (16, 1249936), (32, 624968), (64, 312484), (128, 156242), (256, 78121)]