20554607671 has 4 divisors (see below), whose sum is σ = 22135731352. Its totient is φ = 18973483992.

The previous prime is 20554607627. The next prime is 20554607681. The reversal of 20554607671 is 17670645502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17670645502 = 2 ⋅8835322751.

It is a cyclic number.

It is not a de Polignac number, because 20554607671 - 2¹¹ = 20554605623 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 (20554607681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 790561821 + ... + 790561846.

It is an arithmetic number, because the mean of its divisors is an integer number (5533932838).

Almost surely, 2^20554607671 is an apocalyptic number.

20554607671 is a deficient number, since it is larger than the sum of its proper divisors (1581123681).

20554607671 is a wasteful number, since it uses less digits than its factorization.

20554607671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1581123680.

The product of its (nonzero) digits is 352800, while the sum is 43.

The spelling of 20554607671 in words is "twenty billion, five hundred fifty-four million, six hundred seven thousand, six hundred seventy-one".