20778006 has 8 divisors (see below), whose sum is σ = 41556024. Its totient is φ = 6926000.

The previous prime is 20777989. The next prime is 20778011. The reversal of 20778006 is 60087702.

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

20778006 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1731495 + ... + 1731506.

It is an arithmetic number, because the mean of its divisors is an integer number (5194503).

Almost surely, 2^20778006 is an apocalyptic number.

20778006 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20778006 is a wasteful number, since it uses less digits than its factorization.

20778006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3463006.

The product of its (nonzero) digits is 4704, while the sum is 30.

The square root of 20778006 is about 4558.2898108830. The cubic root of 20778006 is about 274.9168056882.

The spelling of 20778006 in words is "twenty million, seven hundred seventy-eight thousand, six".