20320503 has 32 divisors (see below), whose sum is σ = 32616960. Its totient is φ = 11007360.

The previous prime is 20320483. The next prime is 20320507. The reversal of 20320503 is 30502302.

It is not a de Polignac number, because 20320503 - 2⁶ = 20320439 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20320507) 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, 36876 + ... + 37422.

It is an arithmetic number, because the mean of its divisors is an integer number (1019280).

Almost surely, 2^20320503 is an apocalyptic number.

20320503 is a deficient number, since it is larger than the sum of its proper divisors (12296457).

20320503 is a wasteful number, since it uses less digits than its factorization.

20320503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 647.

The product of its (nonzero) digits is 180, while the sum is 15.

The square root of 20320503 is about 4507.8268600291. The cubic root of 20320503 is about 272.8840495669.

Adding to 20320503 its reverse (30502302), we get a palindrome (50822805).

It can be divided in two parts, 203 and 20503, that added together give a triangular number (20706 = T₂₀₃).

The spelling of 20320503 in words is "twenty million, three hundred twenty thousand, five hundred three".