20835221 has 8 divisors (see below), whose sum is σ = 23102688. Its totient is φ = 18630000.

The previous prime is 20835211. The next prime is 20835233. The reversal of 20835221 is 12253802.

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 20835221 - 2²² = 16640917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20835211) 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, 14855 + ... + 16196.

It is an arithmetic number, because the mean of its divisors is an integer number (2887836).

Almost surely, 2^20835221 is an apocalyptic number.

It is an amenable number.

20835221 is a deficient number, since it is larger than the sum of its proper divisors (2267467).

20835221 is a wasteful number, since it uses less digits than its factorization.

20835221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31123.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 20835221 is about 4564.5614247154. The cubic root of 20835221 is about 275.1689144076.

The spelling of 20835221 in words is "twenty million, eight hundred thirty-five thousand, two hundred twenty-one".