21,380

2² × 5 × 1069

Prime Factor Structure

Factorization String 2^2 × 5 × 1069

Distinct Prime Factors 3

Square Status No

Abundance Measure Abundant

Total Divisors 12

Divisor Sum (σ) 44,940

Proper Divisor Sum 23,560

Digit Sum / Digital Root 14 (Root: 5)

Adjacent Primes #21379 ← → #21383

1 2 4 5 10 20 1,069 2,138 4,276 5,345 10,690 21,380

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

21,380 10,690 5,345 16,036 8,018 4,009 12,028 6,014 3,007 9,022 4,511 13,534 6,767 20,302 10,151 30,454 15,227 45,682 22,841 68,524 34,262 17,131 51,394 25,697 77,092 38,546 19,273 57,820 28,910 14,455 43,366 21,683 65,050 32,525 97,576 48,788 24,394 12,197 36,592 18,296 9,148 4,574 2,287 6,862 3,431 10,294 5,147 15,442 7,721 23,164 11,582 5,791 17,374 8,687 26,062 13,031 39,094 19,547 58,642 29,321

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