Divisor-Related Numbers
- 4/n Problem
- Abundance
- Abundancy
- Achilles Number
- Aliquant Divisor
- Aliquot Cycle
- Aliquot Divisor
- Aliquot Sequence
- Amicable Pair
- Amicable Quadruple
- Antiprime
- Aspiring Number
- Binary Carry Sequence
- Breeder
- Catalan's Aliquot Sequence Conjecture
- Colossally Abundant Number
- Crowd
- Cubefree
- Cubefree Part
- Cubic Part
- D-Number
- e-Divisor
- e-Multiperfect Number
- e-Perfect Number
- Economical Number
- Equidigital Number
- Erdős-Selfridge Function
- Euler's Rule
- Even Perfect Number
- Fermat's Divisor Problem
- Friend
- Friendly Number
- Friendly Pair
- Giuga Number
- Harmonic Divisor Number
- Harshad Number
- Heterogeneous Numbers
- Highly Abundant Number
- Highly Composite Number
- Hoax Number
- Home Prime
- Homogeneous Numbers
- Hyperperfect Number
- Improper Divisor
- Infinitary Multiperfect Number
- Infinitary Perfect Number
- k-ary Divisor
- Kravitz Conjecture
- Least Deficient Number
- Monica Set
- Multiamicable Numbers
- Multiperfect Number
- Multiperfect Number Class
- Multiplicative Perfect Number
- Odd Perfect Number
- Ore's Conjecture
- Pandigital Fraction
- Payam Number
- Perfect Number
- Powerfree
- Powerful Number
- Practical Number
- Primary Pseudoperfect Number
- Primitive Abundant Number
- Primitive Pseudoperfect Number
- Primitive Semiperfect Number
- Proper Divisor
- Proper Factor
- Pseudoperfect Number
- Quasiamicable Pair
- Quasiperfect Number
- Rhonda Number
- Round Number
- Ruler Function
- Ruth-Aaron Pair
- Semiperfect Number
- Smarandache Ceil Function
- Smarandache Function
- Smarandache-Kurepa Function
- Smarandache Near-to-Primorial Function
- Smarandache-Wagstaff Function
- Smith Number
- Smooth Number
- Sociable Numbers
- Solitary Number
- Sous-Double
- Sous-Triple
- Square Part
- Sublime Number
- Sum-Product Number
- Super-Poulet Number
- Superabundant Number
- Superior Highly Composite Number
- Superperfect Number
- Thâbit ibn Kurrah Rule
- Unitary Aliquot Sequence
- Unitary Amicable Pair
- Unitary Multiperfect Number
- Unitary Perfect Number
- Unitary Sociable Numbers
- Untouchable Number
- Weird Number
- Znám's Problem