20550144 has 80 divisors (see below), whose sum is σ = 58040928. Its totient is φ = 6438912.

The previous prime is 20550121. The next prime is 20550199. The reversal of 20550144 is 44105502.

It is a self number, because there is not a number n which added to its sum of digits gives 20550144.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25719 + ... + 26505.

Almost surely, 2^20550144 is an apocalyptic number.

20550144 is a gapful number since it is divisible by the number (24) 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 20550144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29020464).

20550144 is an abundant number, since it is smaller than the sum of its proper divisors (37490784).

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

20550144 is an equidigital number, since it uses as much as digits as its factorization.

20550144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 825 (or 809 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 20550144 is about 4533.2266654117. The cubic root of 20550144 is about 273.9081511455.

Adding to 20550144 its reverse (44105502), we get a palindrome (64655646).

The spelling of 20550144 in words is "twenty million, five hundred fifty thousand, one hundred forty-four".