28206020 has 12 divisors (see below), whose sum is σ = 59232684. Its totient is φ = 11282400.

The previous prime is 28206011. The next prime is 28206023. The reversal of 28206020 is 2060282.

It can be written as a sum of positive squares in 2 ways, for example, as 12222016 + 15984004 = 3496^2 + 3998^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 1410301 = 28206020 / (2 + 8 + 2 + 0 + 6 + 0 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 28205983 and 28206001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28206023) 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 3 ways as a sum of consecutive naturals, for example, 705131 + ... + 705170.

It is an arithmetic number, because the mean of its divisors is an integer number (4936057).

Almost surely, 2^28206020 is an apocalyptic number.

28206020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28206020 is an abundant number, since it is smaller than the sum of its proper divisors (31026664).

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

28206020 is a wasteful number, since it uses less digits than its factorization.

28206020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1410310 (or 1410308 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 28206020 is about 5310.9340044855. The cubic root of 28206020 is about 304.4018376014.

The spelling of 28206020 in words is "twenty-eight million, two hundred six thousand, twenty".