20555503503 has 8 divisors (see below), whose sum is σ = 27479654400. Its totient is φ = 13667510808.

The previous prime is 20555503483. The next prime is 20555503519. The reversal of 20555503503 is 30530555502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20555503503 - 2⁸ = 20555503247 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20555503523) 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 7 ways as a sum of consecutive naturals, for example, 9038223 + ... + 9040496.

It is an arithmetic number, because the mean of its divisors is an integer number (3434956800).

Almost surely, 2^20555503503 is an apocalyptic number.

20555503503 is a deficient number, since it is larger than the sum of its proper divisors (6924150897).

20555503503 is a wasteful number, since it uses less digits than its factorization.

20555503503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18079101.

The product of its (nonzero) digits is 56250, while the sum is 33.

The spelling of 20555503503 in words is "twenty billion, five hundred fifty-five million, five hundred three thousand, five hundred three".