20858543145 has 32 divisors (see below), whose sum is σ = 40452935040. Its totient is φ = 10113232320.

The previous prime is 20858543143. The next prime is 20858543149. The reversal of 20858543145 is 54134585802.

20858543145 is a `hidden beast` number, since 20 + 8 + 585 + 4 + 3 + 1 + 45 = 666.

It is not a de Polignac number, because 20858543145 - 2¹ = 20858543143 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 20858543145.

It is not an unprimeable number, because it can be changed into a prime (20858543143) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7021594 + ... + 7024563.

It is an arithmetic number, because the mean of its divisors is an integer number (1264154220).

Almost surely, 2^20858543145 is an apocalyptic number.

It is an amenable number.

20858543145 is a deficient number, since it is larger than the sum of its proper divisors (19594391895).

20858543145 is a wasteful number, since it uses less digits than its factorization.

20858543145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14046182 (or 14046176 counting only the distinct ones).

The product of its (nonzero) digits is 768000, while the sum is 45.

The spelling of 20858543145 in words is "twenty billion, eight hundred fifty-eight million, five hundred forty-three thousand, one hundred forty-five".