20504155203 has 18 divisors (see below), whose sum is σ = 34452560844. Its totient is φ = 11716659864.

The previous prime is 20504155181. The next prime is 20504155223. The reversal of 20504155203 is 30255140502.

It is a happy number.

20504155203 is a `hidden beast` number, since 2 + 0 + 504 + 155 + 2 + 0 + 3 = 666.

It is not a de Polignac number, because 20504155203 - 2⁸ = 20504154947 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20504155223) 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 17 ways as a sum of consecutive naturals, for example, 23246901 + ... + 23247782.

It is an arithmetic number, because the mean of its divisors is an integer number (1914031158).

Almost surely, 2^20504155203 is an apocalyptic number.

20504155203 is a deficient number, since it is larger than the sum of its proper divisors (13948405641).

20504155203 is a wasteful number, since it uses less digits than its factorization.

20504155203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46494703 (or 46494693 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 27.

Adding to 20504155203 its reverse (30255140502), we get a palindrome (50759295705).

The spelling of 20504155203 in words is "twenty billion, five hundred four million, one hundred fifty-five thousand, two hundred three".