20045551853 has 4 divisors (see below), whose sum is σ = 21224701980. Its totient is φ = 18866401728.

The previous prime is 20045551837. The next prime is 20045551871. The reversal of 20045551853 is 35815554002.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16973399524 + 3072152329 = 130282^2 + 55427^2 .

It is a cyclic number.

It is not a de Polignac number, because 20045551853 - 2⁴ = 20045551837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20045551153) 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, 589575038 + ... + 589575071.

It is an arithmetic number, because the mean of its divisors is an integer number (5306175495).

Almost surely, 2^20045551853 is an apocalyptic number.

It is an amenable number.

20045551853 is a deficient number, since it is larger than the sum of its proper divisors (1179150127).

20045551853 is a wasteful number, since it uses less digits than its factorization.

20045551853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1179150126.

The product of its (nonzero) digits is 120000, while the sum is 38.

The spelling of 20045551853 in words is "twenty billion, forty-five million, five hundred fifty-one thousand, eight hundred fifty-three".