20521575

素因数分解:

$3^2\times 5^2\times {\mathrm{223}}^1\times {\mathrm{409}}^1$

素因数の和:648

約数の個数: 36

約数和(自身を含む): 37011520

約数和(自身を除く): 16489945

約数列:

[1, 3, 5, 9, 15, 25, 45, 75, 223, 225, 409, 669, 1115, 1227, 2007, 2045, 3345, 3681, 5575, 6135, 10035, 10225, 16725, 18405, 30675, 50175, 91207, 92025, 273621, 456035, 820863, 1368105, 2280175, 4104315, 6840525, 20521575]

約数ペア:

[(1, 20521575), (3, 6840525), (5, 4104315), (9, 2280175), (15, 1368105), (25, 820863), (45, 456035), (75, 273621), (223, 92025), (225, 91207), (409, 50175), (669, 30675), (1115, 18405), (1227, 16725), (2007, 10225), (2045, 10035), (3345, 6135), (3681, 5575)]