20425645206 has 16 divisors (see below), whose sum is σ = 45390322800. Its totient is φ = 6808548384.

The previous prime is 20425645169. The next prime is 20425645321. The reversal of 20425645206 is 60254652402.

20425645206 is a `hidden beast` number, since 2 + 0 + 4 + 2 + 5 + 645 + 2 + 0 + 6 = 666.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 189126291 + ... + 189126398.

It is an arithmetic number, because the mean of its divisors is an integer number (2836895175).

Almost surely, 2^20425645206 is an apocalyptic number.

20425645206 is an abundant number, since it is smaller than the sum of its proper divisors (24964677594).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20425645206 is a wasteful number, since it uses less digits than its factorization.

20425645206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 378252700 (or 378252694 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 36.

The spelling of 20425645206 in words is "twenty billion, four hundred twenty-five million, six hundred forty-five thousand, two hundred six".