20778085 has 8 divisors (see below), whose sum is σ = 26017920. Its totient is φ = 15899664.

The previous prime is 20778083. The next prime is 20778113. The reversal of 20778085 is 58087702.

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 20778085 - 2¹ = 20778083 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20778083) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 90225 + ... + 90454.

It is an arithmetic number, because the mean of its divisors is an integer number (3252240).

Almost surely, 2^20778085 is an apocalyptic number.

It is an amenable number.

20778085 is a deficient number, since it is larger than the sum of its proper divisors (5239835).

20778085 is a wasteful number, since it uses less digits than its factorization.

20778085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180707.

The product of its (nonzero) digits is 31360, while the sum is 37.

The square root of 20778085 is about 4558.2984764054. The cubic root of 20778085 is about 274.9171541079.

The spelling of 20778085 in words is "twenty million, seven hundred seventy-eight thousand, eighty-five".