20135280 has 160 divisors (see below), whose sum is σ = 70709760. Its totient is φ = 4695040.

The previous prime is 20135267. The next prime is 20135321. The reversal of 20135280 is 8253102.

It is a congruent number.

It is an unprimeable number.

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, 76429 + ... + 76691.

It is an arithmetic number, because the mean of its divisors is an integer number (441936).

Almost surely, 2^20135280 is an apocalyptic number.

20135280 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 20135280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35354880).

20135280 is an abundant number, since it is smaller than the sum of its proper divisors (50574480).

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

20135280 is a wasteful number, since it uses less digits than its factorization.

20135280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319 (or 313 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 20135280 is about 4487.2352289578. The cubic root of 20135280 is about 272.0523976334.

Adding to 20135280 its reverse (8253102), we get a palindrome (28388382).

The spelling of 20135280 in words is "twenty million, one hundred thirty-five thousand, two hundred eighty".