20028049 has 8 divisors (see below), whose sum is σ = 20576808. Its totient is φ = 19482240.

The previous prime is 20028031. The next prime is 20028053. The reversal of 20028049 is 94082002.

It can be written as a sum of positive squares in 4 ways, for example, as 65025 + 19963024 = 255^2 + 4468^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 20028049 - 2⁵ = 20028017 is a prime.

It is a super-2 number, since 2×20028049² = 802245493492802, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20028059) 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 7 ways as a sum of consecutive naturals, for example, 22399 + ... + 23275.

It is an arithmetic number, because the mean of its divisors is an integer number (2572101).

Almost surely, 2^20028049 is an apocalyptic number.

It is an amenable number.

20028049 is a deficient number, since it is larger than the sum of its proper divisors (548759).

20028049 is an equidigital number, since it uses as much as digits as its factorization.

20028049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1475.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 20028049 is about 4475.2708297934. The cubic root of 20028049 is about 271.5685968841.

The spelling of 20028049 in words is "twenty million, twenty-eight thousand, forty-nine".