20854044539 has 4 divisors (see below), whose sum is σ = 21139716456. Its totient is φ = 20568372624.

The previous prime is 20854044493. The next prime is 20854044611. The reversal of 20854044539 is 93544045802.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93544045802 = 2 ⋅46772022901.

It is a cyclic number.

It is not a de Polignac number, because 20854044539 - 2²⁴ = 20837267323 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20854044539.

It is not an unprimeable number, because it can be changed into a prime (20854041539) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142835849 + ... + 142835994.

It is an arithmetic number, because the mean of its divisors is an integer number (5284929114).

Almost surely, 2^20854044539 is an apocalyptic number.

20854044539 is a deficient number, since it is larger than the sum of its proper divisors (285671917).

20854044539 is an equidigital number, since it uses as much as digits as its factorization.

20854044539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285671916.

The product of its (nonzero) digits is 691200, while the sum is 44.

The spelling of 20854044539 in words is "twenty billion, eight hundred fifty-four million, forty-four thousand, five hundred thirty-nine".