28020533 has 4 divisors (see below), whose sum is σ = 28479948. Its totient is φ = 27561120.

The previous prime is 28020527. The next prime is 28020541. The reversal of 28020533 is 33502082.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 33502082 = 2 ⋅16751041.

It can be written as a sum of positive squares in 2 ways, for example, as 15225604 + 12794929 = 3902^2 + 3577^2 .

It is a cyclic number.

It is not a de Polignac number, because 28020533 - 2⁸ = 28020277 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 28020499 and 28020508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28020523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 229616 + ... + 229737.

It is an arithmetic number, because the mean of its divisors is an integer number (7119987).

Almost surely, 2^28020533 is an apocalyptic number.

It is an amenable number.

28020533 is a deficient number, since it is larger than the sum of its proper divisors (459415).

28020533 is an equidigital number, since it uses as much as digits as its factorization.

28020533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 459414.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 28020533 is about 5293.4424526956. The cubic root of 28020533 is about 303.7331055764.

The spelling of 28020533 in words is "twenty-eight million, twenty thousand, five hundred thirty-three".