20538944 has 28 divisors (see below), whose sum is σ = 41432988. Its totient is φ = 10099200.

The previous prime is 20538937. The next prime is 20538949. The reversal of 20538944 is 44983502.

It can be written as a sum of positive squares in 2 ways, for example, as 6760000 + 13778944 = 2600^2 + 3712^2 .

It is not an unprimeable number, because it can be changed into a prime (20538949) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1274 + ... + 6534.

Almost surely, 2^20538944 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20538944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20716494).

20538944 is an abundant number, since it is smaller than the sum of its proper divisors (20894044).

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

20538944 is an equidigital number, since it uses as much as digits as its factorization.

20538944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5334 (or 5324 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 20538944 is about 4531.9911738661. The cubic root of 20538944 is about 273.8583813600.

The spelling of 20538944 in words is "twenty million, five hundred thirty-eight thousand, nine hundred forty-four".