20549718 has 72 divisors (see below), whose sum is σ = 54098928. Its totient is φ = 5610528.

The previous prime is 20549713. The next prime is 20549729. The reversal of 20549718 is 81794502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20549713) 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 35 ways as a sum of consecutive naturals, for example, 19780 + ... + 20792.

It is an arithmetic number, because the mean of its divisors is an integer number (751374).

Almost surely, 2^20549718 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20549718, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27049464).

20549718 is an abundant number, since it is smaller than the sum of its proper divisors (33549210).

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

20549718 is a wasteful number, since it uses less digits than its factorization.

20549718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1058 (or 1048 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 20549718 is about 4533.1796787685. The cubic root of 20549718 is about 273.9062584471.

The spelling of 20549718 in words is "twenty million, five hundred forty-nine thousand, seven hundred eighteen".