21,394,880

2⁶ × 5 × 13 × 37 × 139

Prime Factor Structure

Factorization String 2^6 × 5 × 13 × 37 × 139

Distinct Prime Factors 5

Square Status No

Abundance Measure Abundant

Total Divisors 112

Divisor Sum (σ) 56,753,760

Proper Divisor Sum 35,358,880

Digit Sum / Digital Root 35 (Root: 8)

Adjacent Primes #21394829 ← → #21394889

1 2 4 5 8 10 13 16 20 26 32 37 40 52 64 65 74 80 104 130 139 148 160 185 208 260 278 296 320 370 416 481 520 556 592 695 740 832 962 1,040 1,112 1,184 1,390 1,480 1,807 1,924 2,080 2,224 2,368 2,405 2,780 2,960 3,614 3,848 4,160 4,448 4,810 5,143 5,560 5,920

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

21,394,880 10,697,440 5,348,720 2,674,360 1,337,180 668,590 334,295 1,002,886 501,443 1,504,330 752,165 2,256,496 1,128,248 564,124 282,062 141,031 423,094 211,547 634,642 317,321 951,964 475,982 237,991 713,974 356,987 1,070,962 535,481 1,606,444 803,222 401,611 1,204,834 602,417 1,807,252 903,626 451,813 1,355,440 677,720 338,860 169,430 84,715 254,146 127,073 381,220 190,610 95,305 285,916 142,958 71,479 214,438 107,219 321,658 160,829 482,488 241,244 120,622 60,311 180,934 90,467 271,402 135,701

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