21809905

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{421}}^1\times {\mathrm{797}}^1$

素因数の和:1236

約数の個数: 16

約数和(自身を含む): 28287504

約数和(自身を除く): 6477599

約数列:

[1, 5, 13, 65, 421, 797, 2105, 3985, 5473, 10361, 27365, 51805, 335537, 1677685, 4361981, 21809905]

約数ペア:

[(1, 21809905), (5, 4361981), (13, 1677685), (65, 335537), (421, 51805), (797, 27365), (2105, 10361), (3985, 5473)]