20430577 has 2 divisors, whose sum is σ = 20430578. Its totient is φ = 20430576.

The previous prime is 20430563. The next prime is 20430589. The reversal of 20430577 is 77503402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20421361 + 9216 = 4519^2 + 96^2 .

It is a cyclic number.

It is not a de Polignac number, because 20430577 - 2¹⁵ = 20397809 is a prime.

It is not a weakly prime, because it can be changed into another prime (20430517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10215288 + 10215289.

It is an arithmetic number, because the mean of its divisors is an integer number (10215289).

Almost surely, 2^20430577 is an apocalyptic number.

It is an amenable number.

20430577 is a deficient number, since it is larger than the sum of its proper divisors (1).

20430577 is an equidigital number, since it uses as much as digits as its factorization.

20430577 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5880, while the sum is 28.

The square root of 20430577 is about 4520.0195796036. The cubic root of 20430577 is about 273.3758904918.

Adding to 20430577 its reverse (77503402), we get a palindrome (97933979).

The spelling of 20430577 in words is "twenty million, four hundred thirty thousand, five hundred seventy-seven".