Electrophotographic photoreceptor, process cartridge, and image-forming apparatus

An electrophotographic photoreceptor comprising:

• a conductive support having an outer peripheral surface with a maximum surface roughness height (Rmax) of about 4.0 μm or less and about 3.0 μm or more, the outer peripheral surface having a recess with a depth-to-aperture size ratio (depth/aperture size) of about 0.03 or more and about 0.12 or less;
• and
• a single-layer photosensitive layer disposed on the conductive support and having a thickness of about 20 μm or more and a modulus of elasticity of about 4.5 GPa or more,
• wherein the conductive support is hollow and has a wall thickness of about 0.8 mm or less.