20138448 has 80 divisors (see below), whose sum is σ = 58139136. Its totient is φ = 5953920.

The previous prime is 20138431. The next prime is 20138449. The reversal of 20138448 is 84483102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20138449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22261 + ... + 23147.

Almost surely, 2^20138448 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 20138448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29069568).

20138448 is an abundant number, since it is smaller than the sum of its proper divisors (38000688).

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

20138448 is a wasteful number, since it uses less digits than its factorization.

20138448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 952 (or 946 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 30.

The square root of 20138448 is about 4487.5882164031. The cubic root of 20138448 is about 272.0666647439.

The spelling of 20138448 in words is "twenty million, one hundred thirty-eight thousand, four hundred forty-eight".