20043442 has 48 divisors (see below), whose sum is σ = 35551872. Its totient is φ = 8426880.

The previous prime is 20043433. The next prime is 20043451. The reversal of 20043442 is 24434002.

It is an interprime number because it is at equal distance from previous prime (20043433) and next prime (20043451).

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 282267 + ... + 282337.

It is an arithmetic number, because the mean of its divisors is an integer number (740664).

Almost surely, 2^20043442 is an apocalyptic number.

20043442 is a deficient number, since it is larger than the sum of its proper divisors (15508430).

20043442 is a wasteful number, since it uses less digits than its factorization.

20043442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151 (or 132 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 19.

The square root of 20043442 is about 4476.9902836616. The cubic root of 20043442 is about 271.6381524181.

Adding to 20043442 its reverse (24434002), we get a palindrome (44477444).

The spelling of 20043442 in words is "twenty million, forty-three thousand, four hundred forty-two".