20503430 has 16 divisors (see below), whose sum is σ = 36974880. Its totient is φ = 8186112.

The previous prime is 20503429. The next prime is 20503433. The reversal of 20503430 is 3430502.

It is a junction number, because it is equal to n+sod(n) for n = 20503399 and 20503408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20503433) 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 7 ways as a sum of consecutive naturals, for example, 4886 + ... + 8054.

It is an arithmetic number, because the mean of its divisors is an integer number (2310930).

Almost surely, 2^20503430 is an apocalyptic number.

20503430 is a deficient number, since it is larger than the sum of its proper divisors (16471450).

20503430 is a wasteful number, since it uses less digits than its factorization.

20503430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3823.

The product of its (nonzero) digits is 360, while the sum is 17.

The square root of 20503430 is about 4528.0713333604. The cubic root of 20503430 is about 273.7004469567.

Adding to 20503430 its reverse (3430502), we get a palindrome (23933932).

The spelling of 20503430 in words is "twenty million, five hundred three thousand, four hundred thirty".