400; twenty bundles with 20 items such as cloths inside; one quimilli referred to a bundle of 20 items, so 20 of these meant 400 total, hence Molina's reference to 400 cloths; this is the vigesimal system par excellence, with probably twenty men carrying bundles of 20 mantas each, to be provided in tributes; while textiles were the usual referent, the quimilli could contain other things
These were bundles that could be carried on a human's back.
"Aztec quimilli 'bundle, bunch' > -quimilli 'twenty=' (numerative for blankets and clothes) (Andrews 1975: 190)."
Afrikanistische Arbeitspapiere, vols. 33-36 (1993), p. 34.
quimil, envoltorio, lio
"...correspondiente a la carga de un hombre, formaban un quimilli, por lo cual quimilli significaba por extensión veinte y su símbolo gráfico representaba carga de artículos textiles..."