λ
Ratio Atlas

520,021

520021
Deficient Odd Prime

520,021 factors as 520021. Its 2 positive divisors give a proper-divisor sum of 1, so this integer is deficient. The Collatz stopping time is 71 steps.

Prime Factor Structure

Factorization String 520021
Distinct Prime Factors 1
Square Status No
Abundance Measure Deficient

Analytical Properties

Total Divisors 2
Divisor Sum (σ) 520,022
Proper Divisor Sum 1
Digit Sum / Digital Root 10 (Root: 1)
Adjacent Primes #520019 ← → #520031

Radix Representation

Decimal 520021
Binary 1111110111101010101 (19 bits)
Octal 0o1767525
Hexadecimal 0x7EF55

Divisor Catalog (2)

Collatz Trajectory (71 steps to reach 1)

Iterative sequence n → n/2 (if even) or 3n+1 (if odd):

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