20403530 has 96 divisors (see below), whose sum is σ = 47779200. Its totient is φ = 6120576.

The previous prime is 20403521. The next prime is 20403541. The reversal of 20403530 is 3530402.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20403499 and 20403508.

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 47 ways as a sum of consecutive naturals, for example, 703556 + ... + 703584.

It is an arithmetic number, because the mean of its divisors is an integer number (497700).

Almost surely, 2^20403530 is an apocalyptic number.

20403530 is an abundant number, since it is smaller than the sum of its proper divisors (27375670).

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

20403530 is a wasteful number, since it uses less digits than its factorization.

20403530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108 (or 85 counting only the distinct ones).

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

The square root of 20403530 is about 4517.0266769192. The cubic root of 20403530 is about 273.2552010800.

Adding to 20403530 its reverse (3530402), we get a palindrome (23933932).

The spelling of 20403530 in words is "twenty million, four hundred three thousand, five hundred thirty".