20,005

5 × 4001

Prime Factor Structure

Factorization String 5 × 4001

Distinct Prime Factors 2

Square Status No

Abundance Measure Deficient

Total Divisors 4

Divisor Sum (σ) 24,012

Proper Divisor Sum 4,007

Digit Sum / Digital Root 7 (Root: 7)

Adjacent Primes #19997 ← → #20011

1 5 4,001 20,005

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

20,005 60,016 30,008 15,004 7,502 3,751 11,254 5,627 16,882 8,441 25,324 12,662 6,331 18,994 9,497 28,492 14,246 7,123 21,370 10,685 32,056 16,028 8,014 4,007 12,022 6,011 18,034 9,017 27,052 13,526 6,763 20,290 10,145 30,436 15,218 7,609 22,828 11,414 5,707 17,122 8,561 25,684 12,842 6,421 19,264 9,632 4,816 2,408 1,204 602 301 904 452 226 113 340 170 85 256 128

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