20806662826 has 4 divisors (see below), whose sum is σ = 31209994242. Its totient is φ = 10403331412.

The previous prime is 20806662809. The next prime is 20806662827. The reversal of 20806662826 is 62826660802.

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., 20797966225 + 8696601 = 144215^2 + 2949^2 .

It is not an unprimeable number, because it can be changed into a prime (20806662827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5201665705 + ... + 5201665708.

Almost surely, 2^20806662826 is an apocalyptic number.

20806662826 is a deficient number, since it is larger than the sum of its proper divisors (10403331416).

20806662826 is a wasteful number, since it uses less digits than its factorization.

20806662826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10403331415.

The product of its (nonzero) digits is 663552, while the sum is 46.

The spelling of 20806662826 in words is "twenty billion, eight hundred six million, six hundred sixty-two thousand, eight hundred twenty-six".