20903085 has 24 divisors (see below), whose sum is σ = 41408640. Its totient is φ = 9555552.

The previous prime is 20903027. The next prime is 20903089. The reversal of 20903085 is 58030902.

It is not a de Polignac number, because 20903085 - 2⁹ = 20902573 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20903089) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 32865 + ... + 33494.

It is an arithmetic number, because the mean of its divisors is an integer number (1725360).

Almost surely, 2^20903085 is an apocalyptic number.

It is an amenable number.

20903085 is a deficient number, since it is larger than the sum of its proper divisors (20505555).

20903085 is a wasteful number, since it uses less digits than its factorization.

20903085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66377 (or 66374 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 20903085 is about 4571.9891732155. The cubic root of 20903085 is about 275.4673485656.

Adding to 20903085 its reverse (58030902), we get a palindrome (78933987).

The spelling of 20903085 in words is "twenty million, nine hundred three thousand, eighty-five".