20135500 has 96 divisors (see below), whose sum is σ = 54931968. Its totient is φ = 6264000.

The previous prime is 20135447. The next prime is 20135501. The reversal of 20135500 is 553102.

It is not an unprimeable number, because it can be changed into a prime (20135501) 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 31 ways as a sum of consecutive naturals, for example, 38239 + ... + 38761.

It is an arithmetic number, because the mean of its divisors is an integer number (572208).

Almost surely, 2^20135500 is an apocalyptic number.

20135500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20135500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27465984).

20135500 is an abundant number, since it is smaller than the sum of its proper divisors (34796468).

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

20135500 is a wasteful number, since it uses less digits than its factorization.

20135500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 560 (or 548 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 16.

The square root of 20135500 is about 4487.2597428720. The cubic root of 20135500 is about 272.0533884533.

Adding to 20135500 its reverse (553102), we get a palindrome (20688602).

The spelling of 20135500 in words is "twenty million, one hundred thirty-five thousand, five hundred".