20,067
20,067 (twenty thousand [and] sixty-seven) is the natural number following 20,066 and preceding 20,068.[1]
In mathematics
The prime factorization of 20067 is 3 * 6689, meaning that 20067 is a composite number with 4 divisors being 1, 3, 6689, and 20067.[1] It is a deficient number, because the sum of the divisors (excluding 20067 itself) is 6693, which is less than 20067.[2][1]
Boring number
As of September 2026, the number 20067 is a boring number, since it only appears once in the On-Line Encyclopedia of Integer Sequences.[3][4] It is also the smallest one.[5] This definition of uninteresting is possible only because the OEIS lists only a finite number of terms for each entry.[3] Being the smallest uninteresting number is considered interesting.[6]
In the OEIS sequence A379570, 20067 is the number of 5-digit numbers that have exactly 8 divisors.[7]
References
- ↑ 1.0 1.1 1.2 Vanovschi, Vitalii. "Properties of the number 20067" (in en). http://www.numberempire.com:80/20067.
- ↑ "The Positive Integer 20067". https://www.positiveintegers.org/20067.
- ↑ 3.0 3.1 Bischoff, Manon. "The Most Boring Number in the World Is ...". https://www.scientificamerican.com/article/the-most-boring-number-in-the-world-is/.
- ↑ Sloane, N. J. A.. "Search: 20067". https://oeis.org/search?q=20067&go=Search.
- ↑ "Reviews" (in en). Mathematics Magazine 96 (4): 479–480. 2023-08-08. doi:10.1080/0025570X.2023.2234204. ISSN 0025-570X. https://www.tandfonline.com/doi/full/10.1080/0025570X.2023.2234204.
- ↑ Chaitin, Gregory (May 2002). Paradoxes of Randomness (Report). CDMTCS Research Report Series. Centre for Discrete Mathematics and Theoretical Computer Science, University of Auckland. CDMTCS-188. https://researchspace.auckland.ac.nz/server/api/core/bitstreams/fc55ef77-69f4-497b-b9e6-8e535a39dcbe/content. Retrieved 2026-09-17.
- ↑ Sloane, N. J. A., ed. "Sequence A379570 (Number of n-digit numbers that have exactly 8 divisors)". OEIS Foundation. https://oeis.org/A379570.
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