20550550277 has 4 divisors (see below), whose sum is σ = 20857274976. Its totient is φ = 20243825580.

The previous prime is 20550550261. The next prime is 20550550327. The reversal of 20550550277 is 77205505502.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20550550277 - 2⁴ = 20550550261 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 20550550277.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20550250277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 153362249 + ... + 153362382.

It is an arithmetic number, because the mean of its divisors is an integer number (5214318744).

Almost surely, 2^20550550277 is an apocalyptic number.

It is an amenable number.

20550550277 is a deficient number, since it is larger than the sum of its proper divisors (306724699).

20550550277 is an equidigital number, since it uses as much as digits as its factorization.

20550550277 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306724698.

The product of its (nonzero) digits is 122500, while the sum is 38.

The spelling of 20550550277 in words is "twenty billion, five hundred fifty million, five hundred fifty thousand, two hundred seventy-seven".