20551241 has 2 divisors, whose sum is σ = 20551242. Its totient is φ = 20551240.

The previous prime is 20551231. The next prime is 20551247. The reversal of 20551241 is 14215502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20286016 + 265225 = 4504^2 + 515^2 .

It is a cyclic number.

It is not a de Polignac number, because 20551241 - 2¹⁰ = 20550217 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20551247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10275620 + 10275621.

It is an arithmetic number, because the mean of its divisors is an integer number (10275621).

Almost surely, 2^20551241 is an apocalyptic number.

It is an amenable number.

20551241 is a deficient number, since it is larger than the sum of its proper divisors (1).

20551241 is an equidigital number, since it uses as much as digits as its factorization.

20551241 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 20551241 is about 4533.3476592911. The cubic root of 20551241 is about 273.9130249459.

Adding to 20551241 its reverse (14215502), we get a palindrome (34766743).

The spelling of 20551241 in words is "twenty million, five hundred fifty-one thousand, two hundred forty-one".