20342221 has 4 divisors (see below), whose sum is σ = 20587392. Its totient is φ = 20097052.

The previous prime is 20342213. The next prime is 20342243. The reversal of 20342221 is 12224302.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20342221 - 2³ = 20342213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20342195 and 20342204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20342921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 122461 + ... + 122626.

It is an arithmetic number, because the mean of its divisors is an integer number (5146848).

Almost surely, 2^20342221 is an apocalyptic number.

It is an amenable number.

20342221 is a deficient number, since it is larger than the sum of its proper divisors (245171).

20342221 is an equidigital number, since it uses as much as digits as its factorization.

20342221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245170.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 20342221 is about 4510.2351379945. The cubic root of 20342221 is about 272.9812319657.

Adding to 20342221 its reverse (12224302), we get a palindrome (32566523).

It can be divided in two parts, 203 and 42221, that added together give a palindrome (42424).

The spelling of 20342221 in words is "twenty million, three hundred forty-two thousand, two hundred twenty-one".