20503285 has 16 divisors (see below), whose sum is σ = 27086400. Its totient is φ = 14775040.

The previous prime is 20503279. The next prime is 20503313. The reversal of 20503285 is 58230502.

It is not a de Polignac number, because 20503285 - 2⁵ = 20503253 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4566 + ... + 7864.

It is an arithmetic number, because the mean of its divisors is an integer number (1692900).

Almost surely, 2^20503285 is an apocalyptic number.

It is an amenable number.

20503285 is a deficient number, since it is larger than the sum of its proper divisors (6583115).

20503285 is a wasteful number, since it uses less digits than its factorization.

20503285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3428.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 20503285 is about 4528.0553221002. The cubic root of 20503285 is about 273.6998017531.

Adding to 20503285 its reverse (58230502), we get a palindrome (78733787).

It can be divided in two parts, 2050 and 3285, that added together give a palindrome (5335).

The spelling of 20503285 in words is "twenty million, five hundred three thousand, two hundred eighty-five".