20778208 has 24 divisors (see below), whose sum is σ = 44626680. Its totient is φ = 9444480.

The previous prime is 20778203. The next prime is 20778211. The reversal of 20778208 is 80287702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20778203) by changing a digit.

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, 29163 + ... + 29866.

It is an arithmetic number, because the mean of its divisors is an integer number (1859445).

Almost surely, 2^20778208 is an apocalyptic number.

It is an amenable number.

20778208 is an abundant number, since it is smaller than the sum of its proper divisors (23848472).

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

20778208 is a wasteful number, since it uses less digits than its factorization.

20778208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59050 (or 59042 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 34.

The square root of 20778208 is about 4558.3119682619. The cubic root of 20778208 is about 274.9176965824.

The spelling of 20778208 in words is "twenty million, seven hundred seventy-eight thousand, two hundred eight".