20224643 has 4 divisors (see below), whose sum is σ = 20258040. Its totient is φ = 20191248.

The previous prime is 20224621. The next prime is 20224651. The reversal of 20224643 is 34642202.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20224643 - 2⁶ = 20224579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20224943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15773 + ... + 17006.

It is an arithmetic number, because the mean of its divisors is an integer number (5064510).

Almost surely, 2^20224643 is an apocalyptic number.

20224643 is a deficient number, since it is larger than the sum of its proper divisors (33397).

20224643 is an equidigital number, since it uses as much as digits as its factorization.

20224643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33396.

The product of its (nonzero) digits is 2304, while the sum is 23.

The square root of 20224643 is about 4497.1816730037. The cubic root of 20224643 is about 272.4542717084.

Adding to 20224643 its reverse (34642202), we get a palindrome (54866845).

The spelling of 20224643 in words is "twenty million, two hundred twenty-four thousand, six hundred forty-three".