20503120 has 80 divisors (see below), whose sum is σ = 54317952. Its totient is φ = 7124480.

The previous prime is 20503117. The next prime is 20503129. The reversal of 20503120 is 2130502.

It is a tau number, because it is divible by the number of its divisors (80).

It is a self number, because there is not a number n which added to its sum of digits gives 20503120.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20503129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19734 + ... + 20746.

Almost surely, 2^20503120 is an apocalyptic number.

20503120 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 20503120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27158976).

20503120 is an abundant number, since it is smaller than the sum of its proper divisors (33814832).

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

20503120 is a wasteful number, since it uses less digits than its factorization.

20503120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1060 (or 1054 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 13.

The square root of 20503120 is about 4528.0371023215. The cubic root of 20503120 is about 273.6990675522.

Adding to 20503120 its reverse (2130502), we get a palindrome (22633622).

The spelling of 20503120 in words is "twenty million, five hundred three thousand, one hundred twenty".