20430071 has 2 divisors, whose sum is σ = 20430072. Its totient is φ = 20430070.

The previous prime is 20430041. The next prime is 20430077. The reversal of 20430071 is 17003402.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20430071 - 2²² = 16235767 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20430077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10215035 + 10215036.

It is an arithmetic number, because the mean of its divisors is an integer number (10215036).

Almost surely, 2^20430071 is an apocalyptic number.

20430071 is a deficient number, since it is larger than the sum of its proper divisors (1).

20430071 is an equidigital number, since it uses as much as digits as its factorization.

20430071 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 168, while the sum is 17.

The square root of 20430071 is about 4519.9636060482. The cubic root of 20430071 is about 273.3736335912.

Adding to 20430071 its reverse (17003402), we get a palindrome (37433473).

The spelling of 20430071 in words is "twenty million, four hundred thirty thousand, seventy-one".