9920

9920 is a positive integer that appears in arithmetic, coding schemes, and cataloging contexts whenever four-digit numerals are used. In base 10 notation it is written as 9920.

In number theory, 9920 is a composite even number. Its prime factorization is 2^6 × 5 × 31, which makes it divisible by many integers, including 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 124, 155, 248, 310, and 620, among others. The factorization also shows that 9920 is a multiple of 155 (since 9920 = 155 × 64) and a multiple of 32 (9920 = 32 × 310). The sum of digits is 9 + 9 + 2 + 0 = 20, so 9920 is a Harshad (Niven) number in base 10, being divisible by the sum of its digits.

Geometrically or numerically, 9920 lies just below 10,000 and is 80 less than that square, since 100^2 = 10,000. It is not a perfect square, and its decimal representation contains two consecutive nines followed by 20.

In practical use, 9920 frequently serves as a numeric identifier, code, or part of a larger sequence in catalogs, inventories, routing numbers, or product SKUs. It does not point to a widely recognized historical year, event, or standard reference in itself, but functions as a convenient numerical label in various systems.