16 out of 20 as a percentage

The number 1 is the first and smallest positive integer in the sequence of natural numbers. It serves as the multiplicative identity in mathematics, meaning any number multiplied by 1 remains unchanged. The number 1 is unique as it is neither considered a prime nor a composite number. It also holds importance in various fields such as digital technology (representing "on" in binary code), physics, and philosophy. Linguistically, "one" is used as a cardinal number for counting and as a gender-neutral pronoun. Historically, the representation of 1 evolved from ancient symbols to the modern Arabic numeral.