20288403 has 6 divisors (see below), whose sum is σ = 29305484. Its totient is φ = 13525596.

The previous prime is 20288393. The next prime is 20288407. The reversal of 20288403 is 30488202.

It is not a de Polignac number, because 20288403 - 2⁶ = 20288339 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20288407) 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 5 ways as a sum of consecutive naturals, for example, 1127125 + ... + 1127142.

Almost surely, 2^20288403 is an apocalyptic number.

20288403 is a deficient number, since it is larger than the sum of its proper divisors (9017081).

20288403 is a wasteful number, since it uses less digits than its factorization.

20288403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2254273 (or 2254270 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 20288403 is about 4504.2649788839. The cubic root of 20288403 is about 272.7402835308.

The spelling of 20288403 in words is "twenty million, two hundred eighty-eight thousand, four hundred three".