20783285 has 8 divisors (see below), whose sum is σ = 25800120. Its totient is φ = 16053184.

The previous prime is 20783267. The next prime is 20783291. The reversal of 20783285 is 58238702.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 7921 + 20775364 = 89^2 + 4558^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 20783285 - 2⁶ = 20783221 is a prime.

It is a Curzon 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, 71522 + ... + 71811.

It is an arithmetic number, because the mean of its divisors is an integer number (3225015).

Almost surely, 2^20783285 is an apocalyptic number.

It is an amenable number.

20783285 is a deficient number, since it is larger than the sum of its proper divisors (5016835).

20783285 is a wasteful number, since it uses less digits than its factorization.

20783285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143367.

The product of its (nonzero) digits is 26880, while the sum is 35.

The square root of 20783285 is about 4558.8688289969. The cubic root of 20783285 is about 274.9400861211.

The spelling of 20783285 in words is "twenty million, seven hundred eighty-three thousand, two hundred eighty-five".