3 × 7 × 17 × 53

Prime Factor Structure

Factorization String 3 × 7 × 17 × 53

Distinct Prime Factors 4

Square Status No

Abundance Measure Deficient

Analytical Properties

Total Divisors 16

Divisor Sum (σ) 31,104

Proper Divisor Sum 12,183

Digit Sum / Digital Root 21 (Root: 3)

Adjacent Primes #18919 ← → #18947

1 3 7 17 21 51 53 119 159 357 371 901 1,113 2,703 6,307 18,921

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

18,921 56,764 28,382 14,191 42,574 21,287 63,862 31,931 95,794 47,897 143,692 71,846 35,923 107,770 53,885 161,656 80,828 40,414 20,207 60,622 30,311 90,934 45,467 136,402 68,201 204,604 102,302 51,151 153,454 76,727 230,182 115,091 345,274 172,637 517,912 258,956 129,478 64,739 194,218 97,109 291,328 145,664 72,832 36,416 18,208 9,104 4,552 2,276 1,138 569 1,708 854 427 1,282 641 1,924 962 481 1,444 722

Other feeder batches with open delivery windows. Each feeder keeps its own target batch.