20778075 has 18 divisors (see below), whose sum is σ = 37216244. Its totient is φ = 11081520.

The previous prime is 20778071. The next prime is 20778083. The reversal of 20778075 is 57087702.

It is not a de Polignac number, because 20778075 - 2² = 20778071 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20778071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 45949 + ... + 46398.

Almost surely, 2^20778075 is an apocalyptic number.

20778075 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20778075 is a deficient number, since it is larger than the sum of its proper divisors (16438169).

20778075 is a wasteful number, since it uses less digits than its factorization.

20778075 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92363 (or 92355 counting only the distinct ones).

The product of its (nonzero) digits is 27440, while the sum is 36.

The square root of 20778075 is about 4558.2973795048. The cubic root of 20778075 is about 274.9171100042.

The spelling of 20778075 in words is "twenty million, seven hundred seventy-eight thousand, seventy-five".