21497680

素因数分解:

$2^4\times 5^1\times {\mathrm{268721}}^1$

素因数の和:268734

約数の個数: 20

約数和(自身を含む): 49982292

約数和(自身を除く): 28484612

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 268721, 537442, 1074884, 1343605, 2149768, 2687210, 4299536, 5374420, 10748840, 21497680]

約数ペア:

[(1, 21497680), (2, 10748840), (4, 5374420), (5, 4299536), (8, 2687210), (10, 2149768), (16, 1343605), (20, 1074884), (40, 537442), (80, 268721)]