20028744 has 24 divisors (see below), whose sum is σ = 54244710. Its totient is φ = 6676224.

The previous prime is 20028739. The next prime is 20028751. The reversal of 20028744 is 44782002.

It can be written as a sum of positive squares in only one way, i.e., 19448100 + 580644 = 4410^2 + 762^2 .

It is a tau number, because it is divible by the number of its divisors (24).

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 5 ways as a sum of consecutive naturals, for example, 139017 + ... + 139160.

Almost surely, 2^20028744 is an apocalyptic number.

20028744 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20028744 is an abundant number, since it is smaller than the sum of its proper divisors (34215966).

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

20028744 is a wasteful number, since it uses less digits than its factorization.

20028744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278189 (or 278182 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 27.

The square root of 20028744 is about 4475.3484780517. The cubic root of 20028744 is about 271.5717381119.

The spelling of 20028744 in words is "twenty million, twenty-eight thousand, seven hundred forty-four".