20028755 has 16 divisors (see below), whose sum is σ = 25893120. Its totient is φ = 14823648.

The previous prime is 20028751. The next prime is 20028773. The reversal of 20028755 is 55782002.

It is not a de Polignac number, because 20028755 - 2² = 20028751 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20028751) 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 15 ways as a sum of consecutive naturals, for example, 1634 + ... + 6536.

It is an arithmetic number, because the mean of its divisors is an integer number (1618320).

Almost surely, 2^20028755 is an apocalyptic number.

20028755 is a deficient number, since it is larger than the sum of its proper divisors (5864365).

20028755 is a wasteful number, since it uses less digits than its factorization.

20028755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4970.

The product of its (nonzero) digits is 5600, while the sum is 29.

The square root of 20028755 is about 4475.3497070061. The cubic root of 20028755 is about 271.5717878286.

The spelling of 20028755 in words is "twenty million, twenty-eight thousand, seven hundred fifty-five".