20431443 has 4 divisors (see below), whose sum is σ = 27241928. Its totient is φ = 13620960.

The previous prime is 20431427. The next prime is 20431451. The reversal of 20431443 is 34413402.

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

It is not a de Polignac number, because 20431443 - 2⁴ = 20431427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20431423) 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, 3405238 + ... + 3405243.

It is an arithmetic number, because the mean of its divisors is an integer number (6810482).

Almost surely, 2^20431443 is an apocalyptic number.

20431443 is a deficient number, since it is larger than the sum of its proper divisors (6810485).

20431443 is an equidigital number, since it uses as much as digits as its factorization.

20431443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6810484.

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

The square root of 20431443 is about 4520.1153746337. The cubic root of 20431443 is about 273.3797530059.

Adding to 20431443 its reverse (34413402), we get a palindrome (54844845).

It can be divided in two parts, 2043 and 1443, that added together give a triangular number (3486 = T₈₃).

The spelling of 20431443 in words is "twenty million, four hundred thirty-one thousand, four hundred forty-three".