20710642 has 4 divisors (see below), whose sum is σ = 31065966. Its totient is φ = 10355320.

The previous prime is 20710601. The next prime is 20710643. The reversal of 20710642 is 24601702.

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., 19989841 + 720801 = 4471^2 + 849^2 .

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 (20710643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5177659 + ... + 5177662.

Almost surely, 2^20710642 is an apocalyptic number.

20710642 is a deficient number, since it is larger than the sum of its proper divisors (10355324).

20710642 is a wasteful number, since it uses less digits than its factorization.

20710642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10355323.

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

The square root of 20710642 is about 4550.8946373213. The cubic root of 20710642 is about 274.6193830877.

The spelling of 20710642 in words is "twenty million, seven hundred ten thousand, six hundred forty-two".