20551134847 has 4 divisors (see below), whose sum is σ = 20553090256. Its totient is φ = 20549179440.

The previous prime is 20551134829. The next prime is 20551134853. The reversal of 20551134847 is 74843115502.

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

It is a cyclic number.

It is not a de Polignac number, because 20551134847 - 2²³ = 20542746239 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 (20551134817) 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, 961854 + ... + 982987.

It is an arithmetic number, because the mean of its divisors is an integer number (5138272564).

Almost surely, 2^20551134847 is an apocalyptic number.

20551134847 is a deficient number, since it is larger than the sum of its proper divisors (1955409).

20551134847 is a wasteful number, since it uses less digits than its factorization.

20551134847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1955408.

The product of its (nonzero) digits is 134400, while the sum is 40.

The spelling of 20551134847 in words is "twenty billion, five hundred fifty-one million, one hundred thirty-four thousand, eight hundred forty-seven".