20551314577 has 4 divisors (see below), whose sum is σ = 20569518820. Its totient is φ = 20533110336.

The previous prime is 20551314557. The next prime is 20551314647. The reversal of 20551314577 is 77541315502.

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 11396843536 + 9154471041 = 106756^2 + 95679^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20551314577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20551314547) 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, 9100428 + ... + 9102685.

It is an arithmetic number, because the mean of its divisors is an integer number (5142379705).

Almost surely, 2^20551314577 is an apocalyptic number.

It is an amenable number.

20551314577 is a deficient number, since it is larger than the sum of its proper divisors (18204243).

20551314577 is a wasteful number, since it uses less digits than its factorization.

20551314577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18204242.

The product of its (nonzero) digits is 147000, while the sum is 40.

The spelling of 20551314577 in words is "twenty billion, five hundred fifty-one million, three hundred fourteen thousand, five hundred seventy-seven".