20356443645 has 8 divisors (see below), whose sum is σ = 32570309856. Its totient is φ = 10856769936.

The previous prime is 20356443629. The next prime is 20356443703. The reversal of 20356443645 is 54634465302.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20356443645 - 2⁴ = 20356443629 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20356443597 and 20356443606.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 678548107 + ... + 678548136.

It is an arithmetic number, because the mean of its divisors is an integer number (4071288732).

Almost surely, 2^20356443645 is an apocalyptic number.

It is an amenable number.

20356443645 is a deficient number, since it is larger than the sum of its proper divisors (12213866211).

20356443645 is a wasteful number, since it uses less digits than its factorization.

20356443645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1357096251.

The product of its (nonzero) digits is 1036800, while the sum is 42.

The spelling of 20356443645 in words is "twenty billion, three hundred fifty-six million, four hundred forty-three thousand, six hundred forty-five".