20551248 has 60 divisors (see below), whose sum is σ = 58870240. Its totient is φ = 6689088.

The previous prime is 20551247. The next prime is 20551253. The reversal of 20551248 is 84215502.

It is a happy number.

It is a super-4 number, since 4×20551248⁴ (a number of 30 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20551241) 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 11 ways as a sum of consecutive naturals, for example, 4533 + ... + 7851.

Almost surely, 2^20551248 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 20551248, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29435120).

20551248 is an abundant number, since it is smaller than the sum of its proper divisors (38318992).

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

20551248 is a wasteful number, since it uses less digits than its factorization.

20551248 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3376 (or 3367 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

The square root of 20551248 is about 4533.3484313474. The cubic root of 20551248 is about 273.9130560452.

The spelling of 20551248 in words is "twenty million, five hundred fifty-one thousand, two hundred forty-eight".