21256240

素因数分解:

$2^4\times 5^1\times {\mathrm{265703}}^1$

素因数の和:265716

約数の個数: 20

約数和(自身を含む): 49420944

約数和(自身を除く): 28164704

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 265703, 531406, 1062812, 1328515, 2125624, 2657030, 4251248, 5314060, 10628120, 21256240]

約数ペア:

[(1, 21256240), (2, 10628120), (4, 5314060), (5, 4251248), (8, 2657030), (10, 2125624), (16, 1328515), (20, 1062812), (40, 531406), (80, 265703)]