19978409

素因数分解:

${\mathrm{11}}^1\times {\mathrm{37}}^1\times {\mathrm{191}}^1\times {\mathrm{257}}^1$

素因数の和:496

約数の個数: 16

約数和(自身を含む): 22588416

約数和(自身を除く): 2610007

約数列:

[1, 11, 37, 191, 257, 407, 2101, 2827, 7067, 9509, 49087, 77737, 104599, 539957, 1816219, 19978409]

約数ペア:

[(1, 19978409), (11, 1816219), (37, 539957), (191, 104599), (257, 77737), (407, 49087), (2101, 9509), (2827, 7067)]