20443142 has 4 divisors (see below), whose sum is σ = 30664716. Its totient is φ = 10221570.

The previous prime is 20443141. The next prime is 20443201. The reversal of 20443142 is 24134402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24134402 = 2 ⋅12067201.

It is a zygodrome in base 7.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20443141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5110784 + ... + 5110787.

It is an arithmetic number, because the mean of its divisors is an integer number (7666179).

Almost surely, 2^20443142 is an apocalyptic number.

20443142 is a deficient number, since it is larger than the sum of its proper divisors (10221574).

20443142 is a wasteful number, since it uses less digits than its factorization.

20443142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10221573.

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 20443142 is about 4521.4092935721. The cubic root of 20443142 is about 273.4319219346.

Adding to 20443142 its reverse (24134402), we get a palindrome (44577544).

The spelling of 20443142 in words is "twenty million, four hundred forty-three thousand, one hundred forty-two".