20226643 has 4 divisors (see below), whose sum is σ = 20235688. Its totient is φ = 20217600.

The previous prime is 20226631. The next prime is 20226649. The reversal of 20226643 is 34662202.

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, and also an emirpimes, since its reverse is a distinct semiprime: 34662202 = 2 ⋅17331101.

It is a cyclic number.

It is not a de Polignac number, because 20226643 - 2²¹ = 18129491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20226649) 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, 1555 + ... + 6547.

It is an arithmetic number, because the mean of its divisors is an integer number (5058922).

Almost surely, 2^20226643 is an apocalyptic number.

20226643 is a deficient number, since it is larger than the sum of its proper divisors (9045).

20226643 is an equidigital number, since it uses as much as digits as its factorization.

20226643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9044.

The product of its (nonzero) digits is 3456, while the sum is 25.

The square root of 20226643 is about 4497.4040289927. The cubic root of 20226643 is about 272.4632523462.

Adding to 20226643 its reverse (34662202), we get a palindrome (54888845).

The spelling of 20226643 in words is "twenty million, two hundred twenty-six thousand, six hundred forty-three".