20538555500 has 48 divisors (see below), whose sum is σ = 44870402304. Its totient is φ = 8212822400.

The previous prime is 20538555481. The next prime is 20538555503. The reversal of 20538555500 is 555583502.

It is not an unprimeable number, because it can be changed into a prime (20538555503) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2704709 + ... + 2712291.

It is an arithmetic number, because the mean of its divisors is an integer number (934800048).

Almost surely, 2^20538555500 is an apocalyptic number.

20538555500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20538555500 is an abundant number, since it is smaller than the sum of its proper divisors (24331846804).

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

20538555500 is a wasteful number, since it uses less digits than its factorization.

20538555500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13019 (or 13007 counting only the distinct ones).

The product of its (nonzero) digits is 150000, while the sum is 38.

The spelling of 20538555500 in words is "twenty billion, five hundred thirty-eight million, five hundred fifty-five thousand, five hundred".