12:15:18:20
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| Harmonics | 12:15:18:20 |
| Subharmonics | 1/(15:12:10:9) |
| Intervals from root | 1/1 – 5/4 – 3/2 – 5/3 |
| Cents from root | 0¢ 386¢ 702¢ 884¢ |
| Step intervals | 5/4, 6/5, 10/9 |
| Step cents | 386¢, 316¢, 182¢ |
| Color name | yo-6 or y6 |
| Prime limit | 5 |
| Genus | 32 ⋅ 5 (45) |
| Intervallic odd limit | 9 |
| Otonal odd limit | 15 |
| Utonal odd limit | 15 |
12:15:18:20 is an added sixth chord in the 5-limit, with steps 5/4, 6/5, and 10/9. See also its homonym 10:12:15:18 (1⁄1–6⁄5–3⁄2–9⁄5), a minor seventh chord.
In the 9-odd-limit, the chord is an anomalous saturated suspension.