20553444 has 72 divisors (see below), whose sum is σ = 54966912. Its totient is φ = 6462720.

The previous prime is 20553443. The next prime is 20553451. The reversal of 20553444 is 44435502.

It is a super-2 number, since 2×20553444² = 844888120522272, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20553443) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 85164 + ... + 85404.

Almost surely, 2^20553444 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 20553444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27483456).

20553444 is an abundant number, since it is smaller than the sum of its proper divisors (34413468).

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

20553444 is a wasteful number, since it uses less digits than its factorization.

20553444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 377 (or 372 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 27.

The square root of 20553444 is about 4533.5906299533. The cubic root of 20553444 is about 273.9228120083.

Adding to 20553444 its reverse (44435502), we get a palindrome (64988946).

The spelling of 20553444 in words is "twenty million, five hundred fifty-three thousand, four hundred forty-four".