20499585100 has 18 divisors (see below), whose sum is σ = 44484099884. Its totient is φ = 8199834000.

The previous prime is 20499585083. The next prime is 20499585157. The reversal of 20499585100 is 158599402.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 102497826 + ... + 102498025.

Almost surely, 2^20499585100 is an apocalyptic number.

20499585100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20499585100 is an abundant number, since it is smaller than the sum of its proper divisors (23984514784).

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

20499585100 is a wasteful number, since it uses less digits than its factorization.

20499585100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204995865 (or 204995858 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 43.

The spelling of 20499585100 in words is "twenty billion, four hundred ninety-nine million, five hundred eighty-five thousand, one hundred".