20285229 has 8 divisors (see below), whose sum is σ = 27076672. Its totient is φ = 13508640.

The previous prime is 20285099. The next prime is 20285263. The reversal of 20285229 is 92258202.

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

It is not a de Polignac number, because 20285229 - 2⁸ = 20284973 is a prime.

It is a super-2 number, since 2×20285229² = 822981031164882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20285196 and 20285205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20285299) 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 7 ways as a sum of consecutive naturals, for example, 9 + ... + 6369.

It is an arithmetic number, because the mean of its divisors is an integer number (3384584).

Almost surely, 2^20285229 is an apocalyptic number.

It is an amenable number.

20285229 is a deficient number, since it is larger than the sum of its proper divisors (6791443).

20285229 is a wasteful number, since it uses less digits than its factorization.

20285229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7427.

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 20285229 is about 4503.9126323676. The cubic root of 20285229 is about 272.7260599239.

The spelling of 20285229 in words is "twenty million, two hundred eighty-five thousand, two hundred twenty-nine".