820,407

3 × 7² × 5581

Prime Factor Structure

Factorization String 3 × 7^2 × 5581

Distinct Prime Factors 3

Square Status No

Abundance Measure Deficient

Total Divisors 12

Divisor Sum (σ) 1,272,696

Proper Divisor Sum 452,289

Digit Sum / Digital Root 21 (Root: 3)

Adjacent Primes #820399 ← → #820409

1 3 7 21 49 147 5,581 16,743 39,067 117,201 273,469 820,407

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

820,407 2,461,222 1,230,611 3,691,834 1,845,917 5,537,752 2,768,876 1,384,438 692,219 2,076,658 1,038,329 3,114,988 1,557,494 778,747 2,336,242 1,168,121 3,504,364 1,752,182 876,091 2,628,274 1,314,137 3,942,412 1,971,206 985,603 2,956,810 1,478,405 4,435,216 2,217,608 1,108,804 554,402 277,201 831,604 415,802 207,901 623,704 311,852 155,926 77,963 233,890 116,945 350,836 175,418 87,709 263,128 131,564 65,782 32,891 98,674 49,337 148,012 74,006 37,003 111,010 55,505 166,516 83,258 41,629 124,888 62,444 31,222

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