20504015550 has 72 divisors (see below), whose sum is σ = 56259586656. Its totient is φ = 5351397120.

The previous prime is 20504015531. The next prime is 20504015557. The reversal of 20504015550 is 5551040502.

20504015550 is a `hidden beast` number, since 2 + 0 + 504 + 0 + 155 + 5 + 0 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20504015557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 463579 + ... + 505878.

It is an arithmetic number, because the mean of its divisors is an integer number (781383148).

Almost surely, 2^20504015550 is an apocalyptic number.

20504015550 is an abundant number, since it is smaller than the sum of its proper divisors (35755571106).

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

20504015550 is a wasteful number, since it uses less digits than its factorization.

20504015550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 969522 (or 969514 counting only the distinct ones).

The product of its (nonzero) digits is 5000, while the sum is 27.

The spelling of 20504015550 in words is "twenty billion, five hundred four million, fifteen thousand, five hundred fifty".