20528403 has 24 divisors (see below), whose sum is σ = 32293008. Its totient is φ = 11563776.

The previous prime is 20528399. The next prime is 20528411. The reversal of 20528403 is 30482502.

It is not a de Polignac number, because 20528403 - 2² = 20528399 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20528423) 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 23 ways as a sum of consecutive naturals, for example, 9775 + ... + 11687.

It is an arithmetic number, because the mean of its divisors is an integer number (1345542).

Almost surely, 2^20528403 is an apocalyptic number.

20528403 is a deficient number, since it is larger than the sum of its proper divisors (11764605).

20528403 is a wasteful number, since it uses less digits than its factorization.

20528403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2003 (or 1996 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 20528403 is about 4530.8280700110. The cubic root of 20528403 is about 273.8115234627.

The spelling of 20528403 in words is "twenty million, five hundred twenty-eight thousand, four hundred three".