20803285 has 8 divisors (see below), whose sum is σ = 25123896. Its totient is φ = 16536000.

The previous prime is 20803267. The next prime is 20803297. The reversal of 20803285 is 58230802.

It can be written as a sum of positive squares in 4 ways, for example, as 381924 + 20421361 = 618^2 + 4519^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20803285 - 2⁵ = 20803253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12466 + ... + 14035.

It is an arithmetic number, because the mean of its divisors is an integer number (3140487).

Almost surely, 2^20803285 is an apocalyptic number.

It is an amenable number.

20803285 is a deficient number, since it is larger than the sum of its proper divisors (4320611).

20803285 is a wasteful number, since it uses less digits than its factorization.

20803285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26663.

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 20803285 is about 4561.0618281273. The cubic root of 20803285 is about 275.0282505413.

The spelling of 20803285 in words is "twenty million, eight hundred three thousand, two hundred eighty-five".