1282000

素因数分解:

$2^4\times 5^3\times {\mathrm{641}}^1$

素因数の和:664

約数の個数: 40

約数和(自身を含む): 3104712

約数和(自身を除く): 1822712

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 40, 50, 80, 100, 125, 200, 250, 400, 500, 641, 1000, 1282, 2000, 2564, 3205, 5128, 6410, 10256, 12820, 16025, 25640, 32050, 51280, 64100, 80125, 128200, 160250, 256400, 320500, 641000, 1282000]

約数ペア:

[(1, 1282000), (2, 641000), (4, 320500), (5, 256400), (8, 160250), (10, 128200), (16, 80125), (20, 64100), (25, 51280), (40, 32050), (50, 25640), (80, 16025), (100, 12820), (125, 10256), (200, 6410), (250, 5128), (400, 3205), (500, 2564), (641, 2000), (1000, 1282)]