20430937 has 2 divisors, whose sum is σ = 20430938. Its totient is φ = 20430936.

The previous prime is 20430931. The next prime is 20430941. The reversal of 20430937 is 73903402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20331081 + 99856 = 4509^2 + 316^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20430937 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20430931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10215468 + 10215469.

It is an arithmetic number, because the mean of its divisors is an integer number (10215469).

Almost surely, 2^20430937 is an apocalyptic number.

It is an amenable number.

20430937 is a deficient number, since it is larger than the sum of its proper divisors (1).

20430937 is an equidigital number, since it uses as much as digits as its factorization.

20430937 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 28.

The square root of 20430937 is about 4520.0594022645. The cubic root of 20430937 is about 273.3774961691.

The spelling of 20430937 in words is "twenty million, four hundred thirty thousand, nine hundred thirty-seven".