20992000 has 104 divisors (see below), whose sum is σ = 53667432. Its totient is φ = 8192000.

The previous prime is 20991989. The next prime is 20992007. The reversal of 20992000 is 29902.

It can be written as a sum of positive squares in 4 ways, for example, as 4734976 + 16257024 = 2176^2 + 4032^2 .

It is a zygodrome in base 4.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20992007) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 511980 + ... + 512020.

It is an arithmetic number, because the mean of its divisors is an integer number (516033).

Almost surely, 2^20992000 is an apocalyptic number.

20992000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20992000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26833716).

20992000 is an abundant number, since it is smaller than the sum of its proper divisors (32675432).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20992000 is an frugal number, since it uses more digits than its factorization.

20992000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80 (or 48 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 20992000 is about 4581.7027402484. The cubic root of 20992000 is about 275.8573792306.

The spelling of 20992000 in words is "twenty million, nine hundred ninety-two thousand".