20142706 has 4 divisors (see below), whose sum is σ = 30214062. Its totient is φ = 10071352.

The previous prime is 20142701. The next prime is 20142719. The reversal of 20142706 is 60724102.

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

It can be written as a sum of positive squares in only one way, i.e., 16475481 + 3667225 = 4059^2 + 1915^2 .

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 not an unprimeable number, because it can be changed into a prime (20142701) 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 as a sum of consecutive naturals, namely, 5035675 + ... + 5035678.

Almost surely, 2^20142706 is an apocalyptic number.

20142706 is the 2839-th centered pentagonal number.

20142706 is a deficient number, since it is larger than the sum of its proper divisors (10071356).

20142706 is a wasteful number, since it uses less digits than its factorization.

20142706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10071355.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 20142706 is about 4488.0626109715. The cubic root of 20142706 is about 272.0858383205.

Adding to 20142706 its reverse (60724102), we get a palindrome (80866808).

The spelling of 20142706 in words is "twenty million, one hundred forty-two thousand, seven hundred six".