20551277 has 2 divisors, whose sum is σ = 20551278. Its totient is φ = 20551276.

The previous prime is 20551253. The next prime is 20551303. The reversal of 20551277 is 77215502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20529961 + 21316 = 4531^2 + 146^2 .

It is a cyclic number.

It is not a de Polignac number, because 20551277 - 2¹⁰ = 20550253 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20551207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10275638 + 10275639.

It is an arithmetic number, because the mean of its divisors is an integer number (10275639).

Almost surely, 2^20551277 is an apocalyptic number.

It is an amenable number.

20551277 is a deficient number, since it is larger than the sum of its proper divisors (1).

20551277 is an equidigital number, since it uses as much as digits as its factorization.

20551277 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4900, while the sum is 29.

The square root of 20551277 is about 4533.3516298650. The cubic root of 20551277 is about 273.9131848853.

Adding to 20551277 its reverse (77215502), we get a palindrome (97766779).

The spelling of 20551277 in words is "twenty million, five hundred fifty-one thousand, two hundred seventy-seven".