20206443 has 16 divisors (see below), whose sum is σ = 29594880. Its totient is φ = 12206304.

The previous prime is 20206427. The next prime is 20206453. The reversal of 20206443 is 34460202.

It is not a de Polignac number, because 20206443 - 2⁴ = 20206427 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20206453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6396 + ... + 9017.

It is an arithmetic number, because the mean of its divisors is an integer number (1849680).

Almost surely, 2^20206443 is an apocalyptic number.

20206443 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

20206443 is a deficient number, since it is larger than the sum of its proper divisors (9388437).

20206443 is a wasteful number, since it uses less digits than its factorization.

20206443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15458.

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 20206443 is about 4495.1577280447. The cubic root of 20206443 is about 272.3725206830.

Adding to 20206443 its reverse (34460202), we get a palindrome (54666645).

The spelling of 20206443 in words is "twenty million, two hundred six thousand, four hundred forty-three".