20574221 has 4 divisors (see below), whose sum is σ = 20585244. Its totient is φ = 20563200.

The previous prime is 20574217. The next prime is 20574223. The reversal of 20574221 is 12247502.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 198025 + 20376196 = 445^2 + 4514^2 .

It is a cyclic number.

It is not a de Polignac number, because 20574221 - 2² = 20574217 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 (20574223) 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, 1940 + ... + 6701.

It is an arithmetic number, because the mean of its divisors is an integer number (5146311).

Almost surely, 2^20574221 is an apocalyptic number.

It is an amenable number.

20574221 is a deficient number, since it is larger than the sum of its proper divisors (11023).

20574221 is an equidigital number, since it uses as much as digits as its factorization.

20574221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11022.

The product of its (nonzero) digits is 1120, while the sum is 23.

The square root of 20574221 is about 4535.8815019795. The cubic root of 20574221 is about 274.0150816640.

The spelling of 20574221 in words is "twenty million, five hundred seventy-four thousand, two hundred twenty-one".