20440142 has 8 divisors (see below), whose sum is σ = 30902016. Its totient is φ = 10139472.

The previous prime is 20440111. The next prime is 20440151. The reversal of 20440142 is 24104402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 20440142.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39983 + ... + 40490.

It is an arithmetic number, because the mean of its divisors is an integer number (3862752).

Almost surely, 2^20440142 is an apocalyptic number.

20440142 is a deficient number, since it is larger than the sum of its proper divisors (10461874).

20440142 is a wasteful number, since it uses less digits than its factorization.

20440142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80602.

The product of its (nonzero) digits is 256, while the sum is 17.

The square root of 20440142 is about 4521.0775264311. The cubic root of 20440142 is about 273.4185460408.

Adding to 20440142 its reverse (24104402), we get a palindrome (44544544).

The spelling of 20440142 in words is "twenty million, four hundred forty thousand, one hundred forty-two".