20418142 has 4 divisors (see below), whose sum is σ = 30627216. Its totient is φ = 10209070.

The previous prime is 20418137. The next prime is 20418157. The reversal of 20418142 is 24181402.

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

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5104534 + ... + 5104537.

It is an arithmetic number, because the mean of its divisors is an integer number (7656804).

Almost surely, 2^20418142 is an apocalyptic number.

20418142 is a deficient number, since it is larger than the sum of its proper divisors (10209074).

20418142 is a wasteful number, since it uses less digits than its factorization.

20418142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10209073.

The product of its (nonzero) digits is 512, while the sum is 22.

The square root of 20418142 is about 4518.6438230956. The cubic root of 20418142 is about 273.3204161389.

Adding to 20418142 its reverse (24181402), we get a palindrome (44599544).

The spelling of 20418142 in words is "twenty million, four hundred eighteen thousand, one hundred forty-two".