20500577 has 2 divisors, whose sum is σ = 20500578. Its totient is φ = 20500576.

The previous prime is 20500541. The next prime is 20500591. The reversal of 20500577 is 77500502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13366336 + 7134241 = 3656^2 + 2671^2 .

It is a cyclic number.

It is not a de Polignac number, because 20500577 - 2¹⁰ = 20499553 is a prime.

It is not a weakly prime, because it can be changed into another prime (20503577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10250288 + 10250289.

It is an arithmetic number, because the mean of its divisors is an integer number (10250289).

Almost surely, 2^20500577 is an apocalyptic number.

It is an amenable number.

20500577 is a deficient number, since it is larger than the sum of its proper divisors (1).

20500577 is an equidigital number, since it uses as much as digits as its factorization.

20500577 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2450, while the sum is 26.

The square root of 20500577 is about 4527.7562876109. The cubic root of 20500577 is about 273.6877514614.

The spelling of 20500577 in words is "twenty million, five hundred thousand, five hundred seventy-seven".