18987515

素因数分解:

$5^1\times {\mathrm{53}}^1\times {\mathrm{137}}^1\times {\mathrm{523}}^1$

素因数の和:718

約数の個数: 16

約数和(自身を含む): 23429088

約数和(自身を除く): 4441573

約数列:

[1, 5, 53, 137, 265, 523, 685, 2615, 7261, 27719, 36305, 71651, 138595, 358255, 3797503, 18987515]

約数ペア:

[(1, 18987515), (5, 3797503), (53, 358255), (137, 138595), (265, 71651), (523, 36305), (685, 27719), (2615, 7261)]