20858544886 has 16 divisors (see below), whose sum is σ = 31543056720. Its totient is φ = 10344336480.

The previous prime is 20858544851. The next prime is 20858544887. The reversal of 20858544886 is 68844585802.

It is a super-2 number, since 2×20858544886² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20858544886.

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 7 ways as a sum of consecutive naturals, for example, 259600 + ... + 330316.

It is an arithmetic number, because the mean of its divisors is an integer number (1971441045).

Almost surely, 2^20858544886 is an apocalyptic number.

20858544886 is a deficient number, since it is larger than the sum of its proper divisors (10684511834).

20858544886 is a wasteful number, since it uses less digits than its factorization.

20858544886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71919.

The product of its (nonzero) digits is 19660800, while the sum is 58.

The spelling of 20858544886 in words is "twenty billion, eight hundred fifty-eight million, five hundred forty-four thousand, eight hundred eighty-six".