128200420

素因数分解:

$2^2\times 5^1\times {\mathrm{311}}^1\times {\mathrm{20611}}^1$

素因数の和:20931

約数の個数: 24

約数和(自身を含む): 270099648

約数和(自身を除く): 141899228

約数列:

[1, 2, 4, 5, 10, 20, 311, 622, 1244, 1555, 3110, 6220, 20611, 41222, 82444, 103055, 206110, 412220, 6410021, 12820042, 25640084, 32050105, 64100210, 128200420]

約数ペア:

[(1, 128200420), (2, 64100210), (4, 32050105), (5, 25640084), (10, 12820042), (20, 6410021), (311, 412220), (622, 206110), (1244, 103055), (1555, 82444), (3110, 41222), (6220, 20611)]