20215443 has 4 divisors (see below), whose sum is σ = 26953928. Its totient is φ = 13476960.

The previous prime is 20215417. The next prime is 20215451. The reversal of 20215443 is 34451202.

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

It is not a de Polignac number, because 20215443 - 2¹³ = 20207251 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20215463) 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 3 ways as a sum of consecutive naturals, for example, 3369238 + ... + 3369243.

It is an arithmetic number, because the mean of its divisors is an integer number (6738482).

Almost surely, 2^20215443 is an apocalyptic number.

20215443 is a deficient number, since it is larger than the sum of its proper divisors (6738485).

20215443 is an equidigital number, since it uses as much as digits as its factorization.

20215443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6738484.

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 20215443 is about 4496.1586938185. The cubic root of 20215443 is about 272.4129531469.

Adding to 20215443 its reverse (34451202), we get a palindrome (54666645).

The spelling of 20215443 in words is "twenty million, two hundred fifteen thousand, four hundred forty-three".