21428855

素因数分解:

$5^1\times 7^1\times {\mathrm{41}}^1\times {\mathrm{109}}^1\times {\mathrm{137}}^1$

素因数の和:299

約数の個数: 32

約数和(自身を含む): 30602880

約数和(自身を除く): 9174025

約数列:

[1, 5, 7, 35, 41, 109, 137, 205, 287, 545, 685, 763, 959, 1435, 3815, 4469, 4795, 5617, 14933, 22345, 28085, 31283, 39319, 74665, 104531, 156415, 196595, 522655, 612253, 3061265, 4285771, 21428855]

約数ペア:

[(1, 21428855), (5, 4285771), (7, 3061265), (35, 612253), (41, 522655), (109, 196595), (137, 156415), (205, 104531), (287, 74665), (545, 39319), (685, 31283), (763, 28085), (959, 22345), (1435, 14933), (3815, 5617), (4469, 4795)]