21478975

素因数分解:

$5^2\times 7^1\times {\mathrm{139}}^1\times {\mathrm{883}}^1$

素因数の和:1039

約数の個数: 24

約数和(自身を含む): 30692480

約数和(自身を除く): 9213505

約数列:

[1, 5, 7, 25, 35, 139, 175, 695, 883, 973, 3475, 4415, 4865, 6181, 22075, 24325, 30905, 122737, 154525, 613685, 859159, 3068425, 4295795, 21478975]

約数ペア:

[(1, 21478975), (5, 4295795), (7, 3068425), (25, 859159), (35, 613685), (139, 154525), (175, 122737), (695, 30905), (883, 24325), (973, 22075), (3475, 6181), (4415, 4865)]