19778005

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{137}}^1\times {\mathrm{2221}}^1$

素因数の和:2376

約数の個数: 16

約数和(自身を含む): 25757424

約数和(自身を除く): 5979419

約数列:

[1, 5, 13, 65, 137, 685, 1781, 2221, 8905, 11105, 28873, 144365, 304277, 1521385, 3955601, 19778005]

約数ペア:

[(1, 19778005), (5, 3955601), (13, 1521385), (65, 304277), (137, 144365), (685, 28873), (1781, 11105), (2221, 8905)]