20520550 has 12 divisors (see below), whose sum is σ = 38168316. Its totient is φ = 8208200.

The previous prime is 20520527. The next prime is 20520553. The reversal of 20520550 is 5502502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20520553) 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 5 ways as a sum of consecutive naturals, for example, 205156 + ... + 205255.

It is an arithmetic number, because the mean of its divisors is an integer number (3180693).

Almost surely, 2^20520550 is an apocalyptic number.

20520550 is a deficient number, since it is larger than the sum of its proper divisors (17647766).

20520550 is a wasteful number, since it uses less digits than its factorization.

20520550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410423 (or 410418 counting only the distinct ones).

The product of its (nonzero) digits is 500, while the sum is 19.

The square root of 20520550 is about 4529.9613684887. The cubic root of 20520550 is about 273.7766041018.

The spelling of 20520550 in words is "twenty million, five hundred twenty thousand, five hundred fifty".