20551488 has 56 divisors (see below), whose sum is σ = 56266080. Its totient is φ = 6612480.

The previous prime is 20551477. The next prime is 20551493. The reversal of 20551488 is 88415502.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 3723 + ... + 7413.

Almost surely, 2^20551488 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 20551488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28133040).

20551488 is an abundant number, since it is smaller than the sum of its proper divisors (35714592).

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

20551488 is a wasteful number, since it uses less digits than its factorization.

20551488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3735 (or 3725 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 33.

The square root of 20551488 is about 4533.3749017702. The cubic root of 20551488 is about 273.9141223045.

The spelling of 20551488 in words is "twenty million, five hundred fifty-one thousand, four hundred eighty-eight".