20089556 has 6 divisors (see below), whose sum is σ = 35156730. Its totient is φ = 10044776.

The previous prime is 20089541. The next prime is 20089561. The reversal of 20089556 is 65598002.

It can be written as a sum of positive squares in only one way, i.e., 19945156 + 144400 = 4466^2 + 380^2 .

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 as a sum of consecutive naturals, namely, 2511191 + ... + 2511198.

It is an arithmetic number, because the mean of its divisors is an integer number (5859455).

Almost surely, 2^20089556 is an apocalyptic number.

It is an amenable number.

20089556 is a deficient number, since it is larger than the sum of its proper divisors (15067174).

20089556 is a wasteful number, since it uses less digits than its factorization.

20089556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5022393 (or 5022391 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 35.

The square root of 20089556 is about 4482.1374365363. The cubic root of 20089556 is about 271.8463124000.

The spelling of 20089556 in words is "twenty million, eighty-nine thousand, five hundred fifty-six".