20898221 has 8 divisors (see below), whose sum is σ = 21638784. Its totient is φ = 20170080.

The previous prime is 20898217. The next prime is 20898223. The reversal of 20898221 is 12289802.

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 20898221 - 2² = 20898217 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 (20898223) 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, 386 + ... + 6476.

It is an arithmetic number, because the mean of its divisors is an integer number (2704848).

Almost surely, 2^20898221 is an apocalyptic number.

It is an amenable number.

20898221 is a deficient number, since it is larger than the sum of its proper divisors (740563).

20898221 is an equidigital number, since it uses as much as digits as its factorization.

20898221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6211.

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 20898221 is about 4571.4572074996. The cubic root of 20898221 is about 275.4459804737.

The spelling of 20898221 in words is "twenty million, eight hundred ninety-eight thousand, two hundred twenty-one".