20858543547 has 16 divisors (see below), whose sum is σ = 27944724000. Its totient is φ = 13839081984.

The previous prime is 20858543527. The next prime is 20858543549. The reversal of 20858543547 is 74534585802.

It is not a de Polignac number, because 20858543547 - 2⁸ = 20858543291 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20858543547.

It is not an unprimeable number, because it can be changed into a prime (20858543549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2117229 + ... + 2127057.

It is an arithmetic number, because the mean of its divisors is an integer number (1746545250).

Almost surely, 2^20858543547 is an apocalyptic number.

20858543547 is a deficient number, since it is larger than the sum of its proper divisors (7086180453).

20858543547 is a wasteful number, since it uses less digits than its factorization.

20858543547 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13150.

The product of its (nonzero) digits is 5376000, while the sum is 51.

The spelling of 20858543547 in words is "twenty billion, eight hundred fifty-eight million, five hundred forty-three thousand, five hundred forty-seven".