20535221 has 8 divisors (see below), whose sum is σ = 23912064. Its totient is φ = 17269200.

The previous prime is 20535217. The next prime is 20535227. The reversal of 20535221 is 12253502.

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 20535221 - 2² = 20535217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20535193 and 20535202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20535227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27305 + ... + 28046.

It is an arithmetic number, because the mean of its divisors is an integer number (2989008).

Almost surely, 2^20535221 is an apocalyptic number.

It is an amenable number.

20535221 is a deficient number, since it is larger than the sum of its proper divisors (3376843).

20535221 is an equidigital number, since it uses as much as digits as its factorization.

20535221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55411.

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 20535221 is about 4531.5804086433. The cubic root of 20535221 is about 273.8418333433.

Adding to 20535221 its reverse (12253502), we get a palindrome (32788723).

The spelling of 20535221 in words is "twenty million, five hundred thirty-five thousand, two hundred twenty-one".