19 20 21 22 23 24 25 26 27 28 29 30
| |||
Glavni števnik | dvajset | ||
Vrstilni števnik | dvajseti | ||
Razcep | |||
Rimska številka | XX | ||
Dvojiško | 10100 | ||
Šestnajstiško | 14 | ||
Matematične lastnosti | |||
---|---|---|---|
φ(20) = 8 | |||
τ(20) = 5 {1, 2, 4, 5, 10, 20} | |||
σ(20) = 42 | |||
π(20) = 8 | |||
μ(20) = 0 | |||
M(20) = -3 |
20 (dvájset) je naravno število, za katero velja 20 = 19 + 1 = 21 − 1.
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