20858544885 has 16 divisors (see below), whose sum is σ = 33437496384. Its totient is φ = 11103282432.

The previous prime is 20858544851. The next prime is 20858544887. The reversal of 20858544885 is 58844585802.

It is a happy number.

It is not a de Polignac number, because 20858544885 - 2¹⁰ = 20858543861 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20858544887) 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 in 15 ways as a sum of consecutive naturals, for example, 1321572 + ... + 1337261.

It is an arithmetic number, because the mean of its divisors is an integer number (2089843524).

Almost surely, 2^20858544885 is an apocalyptic number.

It is an amenable number.

20858544885 is a deficient number, since it is larger than the sum of its proper divisors (12578951499).

20858544885 is a wasteful number, since it uses less digits than its factorization.

20858544885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2659364.

The product of its (nonzero) digits is 16384000, while the sum is 57.

The spelling of 20858544885 in words is "twenty billion, eight hundred fifty-eight million, five hundred forty-four thousand, eight hundred eighty-five".