100000000000000000000

100000000000000000000, also written as 10^20, is the integer equal to ten raised to the twentieth power. In decimal notation it is a 1 followed by twenty zeros, and thus consists of twenty-one digits. In ordinary handwriting, it appears as 100,000,000,000,000,000,000.

Naming and scales: In the short scale used in most English-speaking contexts, it is called one hundred quintillion. Names for large numbers vary by country and historical convention; in some long-scale systems the corresponding term would differ, and it is often described simply as 10^20.

Mathematical properties: It equals (2×5)^20 = 2^20 × 5^20; it is even, divisible by 2 and by 5; it is a composite number. It represents the value obtained by multiplying ten by itself twenty times. The number is primarily encountered in mathematical examples and theoretical discussions of large magnitudes, rather than in everyday measurements.