20550377 has 2 divisors, whose sum is σ = 20550378. Its totient is φ = 20550376.

The previous prime is 20550347. The next prime is 20550391. The reversal of 20550377 is 77305502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11162281 + 9388096 = 3341^2 + 3064^2 .

It is a cyclic number.

It is not a de Polignac number, because 20550377 - 2⁸ = 20550121 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20550347) 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 as a sum of consecutive naturals, namely, 10275188 + 10275189.

It is an arithmetic number, because the mean of its divisors is an integer number (10275189).

Almost surely, 2^20550377 is an apocalyptic number.

It is an amenable number.

20550377 is a deficient number, since it is larger than the sum of its proper divisors (1).

20550377 is an equidigital number, since it uses as much as digits as its factorization.

20550377 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7350, while the sum is 29.

The square root of 20550377 is about 4533.2523644730. The cubic root of 20550377 is about 273.9091863428.

Adding to 20550377 its reverse (77305502), we get a palindrome (97855879).

The spelling of 20550377 in words is "twenty million, five hundred fifty thousand, three hundred seventy-seven".