20555550500 has 24 divisors (see below), whose sum is σ = 44893323384. Its totient is φ = 8222220000.

The previous prime is 20555550479. The next prime is 20555550553. The reversal of 20555550500 is 505555502.

It can be written as a sum of positive squares in 4 ways, for example, as 678498304 + 19877052196 = 26048^2 + 140986^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20555051 + ... + 20556050.

It is an arithmetic number, because the mean of its divisors is an integer number (1870555141).

Almost surely, 2^20555550500 is an apocalyptic number.

20555550500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20555550500 is an abundant number, since it is smaller than the sum of its proper divisors (24337772884).

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

20555550500 is a wasteful number, since it uses less digits than its factorization.

20555550500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41111120 (or 41111108 counting only the distinct ones).

The product of its (nonzero) digits is 31250, while the sum is 32.

It can be divided in two parts, 2055 and 5550500, that added together give a palindrome (5552555).

The spelling of 20555550500 in words is "twenty billion, five hundred fifty-five million, five hundred fifty thousand, five hundred".