256400

素因数分解:

$2^4\times 5^2\times {\mathrm{641}}^1$

素因数の和:659

約数の個数: 30

約数和(自身を含む): 616962

約数和(自身を除く): 360562

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 40, 50, 80, 100, 200, 400, 641, 1282, 2564, 3205, 5128, 6410, 10256, 12820, 16025, 25640, 32050, 51280, 64100, 128200, 256400]

約数ペア:

[(1, 256400), (2, 128200), (4, 64100), (5, 51280), (8, 32050), (10, 25640), (16, 16025), (20, 12820), (25, 10256), (40, 6410), (50, 5128), (80, 3205), (100, 2564), (200, 1282), (400, 641)]