2² × 5 × 13 × 991

Prime Factor Structure

Factorization String 2^2 × 5 × 13 × 991

Distinct Prime Factors 4

Square Status No

Abundance Measure Abundant

Analytical Properties

Total Divisors 24

Divisor Sum (σ) 583,296

Proper Divisor Sum 325,636

Digit Sum / Digital Root 26 (Root: 8)

Adjacent Primes #257657 ← → #257671

1 2 4 5 10 13 20 26 52 65 130 260 991 1,982 3,964 4,955 9,910 12,883 19,820 25,766 51,532 64,415 128,830 257,660

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

257,660 128,830 64,415 193,246 96,623 289,870 144,935 434,806 217,403 652,210 326,105 978,316 489,158 244,579 733,738 366,869 1,100,608 550,304 275,152 137,576 68,788 34,394 17,197 51,592 25,796 12,898 6,449 19,348 9,674 4,837 14,512 7,256 3,628 1,814 907 2,722 1,361 4,084 2,042 1,021 3,064 1,532 766 383 1,150 575 1,726 863 2,590 1,295 3,886 1,943 5,830 2,915 8,746 4,373 13,120 6,560 3,280 1,640

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