81621215

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{397}}^1\times {\mathrm{3163}}^1$

素因数の和:3578

約数の個数: 16

約数和(自身を含む): 105778848

約数和(自身を除く): 24157633

約数列:

[1, 5, 13, 65, 397, 1985, 3163, 5161, 15815, 25805, 41119, 205595, 1255711, 6278555, 16324243, 81621215]

約数ペア:

[(1, 81621215), (5, 16324243), (13, 6278555), (65, 1255711), (397, 205595), (1985, 41119), (3163, 25805), (5161, 15815)]