21608015

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{47}}^1\times {\mathrm{643}}^1$

素因数の和:719

約数の個数: 32

約数和(自身を含む): 31159296

約数和(自身を除く): 9551281

約数列:

[1, 5, 11, 13, 47, 55, 65, 143, 235, 517, 611, 643, 715, 2585, 3055, 3215, 6721, 7073, 8359, 30221, 33605, 35365, 41795, 91949, 151105, 332431, 392873, 459745, 1662155, 1964365, 4321603, 21608015]

約数ペア:

[(1, 21608015), (5, 4321603), (11, 1964365), (13, 1662155), (47, 459745), (55, 392873), (65, 332431), (143, 151105), (235, 91949), (517, 41795), (611, 35365), (643, 33605), (715, 30221), (2585, 8359), (3055, 7073), (3215, 6721)]