2² × 5 × 19937

Prime Factor Structure

Factorization String 2^2 × 5 × 19937

Distinct Prime Factors 3

Square Status No

Abundance Measure Abundant

Analytical Properties

Total Divisors 12

Divisor Sum (σ) 837,396

Proper Divisor Sum 438,656

Digit Sum / Digital Root 31 (Root: 4)

Adjacent Primes #398731 ← → #398759

1 2 4 5 10 20 19,937 39,874 79,748 99,685 199,370 398,740

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

398,740 199,370 99,685 299,056 149,528 74,764 37,382 18,691 56,074 28,037 84,112 42,056 21,028 10,514 5,257 15,772 7,886 3,943 11,830 5,915 17,746 8,873 26,620 13,310 6,655 19,966 9,983 29,950 14,975 44,926 22,463 67,390 33,695 101,086 50,543 151,630 75,815 227,446 113,723 341,170 170,585 511,756 255,878 127,939 383,818 191,909 575,728 287,864 143,932 71,966 35,983 107,950 53,975 161,926 80,963 242,890 121,445 364,336 182,168 91,084

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