20000055 has 16 divisors (see below), whose sum is σ = 32066784. Its totient is φ = 10644480.

The previous prime is 20000047. The next prime is 20000059. The reversal of 20000055 is 55000002.

It is not a de Polignac number, because 20000055 - 2³ = 20000047 is a prime.

20000055 is a modest number, since divided by 55 gives 20 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20000059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8175 + ... + 10335.

It is an arithmetic number, because the mean of its divisors is an integer number (2004174).

Almost surely, 2^20000055 is an apocalyptic number.

20000055 is a deficient number, since it is larger than the sum of its proper divisors (12066729).

20000055 is a wasteful number, since it uses less digits than its factorization.

20000055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2786.

The product of its (nonzero) digits is 50, while the sum is 12.

The square root of 20000055 is about 4472.1421041823. The cubic root of 20000055 is about 271.4420104809.

Adding to 20000055 its reverse (55000002), we get a palindrome (75000057).

The spelling of 20000055 in words is "twenty million, fifty-five", and thus it is an aban number and an uban number.