20923000 has 128 divisors (see below), whose sum is σ = 58032000. Its totient is φ = 7056000.

The previous prime is 20922991. The next prime is 20923003. The reversal of 20923000 is 32902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20923003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 342970 + ... + 343030.

It is an arithmetic number, because the mean of its divisors is an integer number (453375).

Almost surely, 2^20923000 is an apocalyptic number.

20923000 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 20923000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29016000).

20923000 is an abundant number, since it is smaller than the sum of its proper divisors (37109000).

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

20923000 is an equidigital number, since it uses as much as digits as its factorization.

20923000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103 (or 75 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 20923000 is about 4574.1665907573. The cubic root of 20923000 is about 275.5548028172.

Adding to 20923000 its reverse (32902), we get a palindrome (20955902).

The spelling of 20923000 in words is "twenty million, nine hundred twenty-three thousand".