20738443 has 16 divisors (see below), whose sum is σ = 24186240. Its totient is φ = 17582400.

The previous prime is 20738407. The next prime is 20738447. The reversal of 20738443 is 34483702.

It is a happy number.

It is not a de Polignac number, because 20738443 - 2⁹ = 20737931 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20738447) 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, 13263 + ... + 14743.

It is an arithmetic number, because the mean of its divisors is an integer number (1511640).

Almost surely, 2^20738443 is an apocalyptic number.

20738443 is a deficient number, since it is larger than the sum of its proper divisors (3447797).

20738443 is a wasteful number, since it uses less digits than its factorization.

20738443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1578.

The product of its (nonzero) digits is 16128, while the sum is 31.

The square root of 20738443 is about 4553.9480673367. The cubic root of 20738443 is about 274.7422068975.

The spelling of 20738443 in words is "twenty million, seven hundred thirty-eight thousand, four hundred forty-three".