20005550 has 24 divisors (see below), whose sum is σ = 38006496. Its totient is φ = 7831040.

The previous prime is 20005541. The next prime is 20005589. The reversal of 20005550 is 5550002.

It is a happy number.

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 11 ways as a sum of consecutive naturals, for example, 1907 + ... + 6606.

It is an arithmetic number, because the mean of its divisors is an integer number (1583604).

Almost surely, 2^20005550 is an apocalyptic number.

20005550 is a deficient number, since it is larger than the sum of its proper divisors (18000946).

20005550 is a wasteful number, since it uses less digits than its factorization.

20005550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8572 (or 8567 counting only the distinct ones).

The product of its (nonzero) digits is 250, while the sum is 17.

The square root of 20005550 is about 4472.7564208215. The cubic root of 20005550 is about 271.4668677003.

Adding to 20005550 its reverse (5550002), we get a palindrome (25555552).

The spelling of 20005550 in words is "twenty million, five thousand, five hundred fifty".