20375909 has 2 divisors, whose sum is σ = 20375910. Its totient is φ = 20375908.

The previous prime is 20375881. The next prime is 20375921. The reversal of 20375909 is 90957302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13667809 + 6708100 = 3697^2 + 2590^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20375909 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20375969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10187954 + 10187955.

It is an arithmetic number, because the mean of its divisors is an integer number (10187955).

Almost surely, 2^20375909 is an apocalyptic number.

It is an amenable number.

20375909 is a deficient number, since it is larger than the sum of its proper divisors (1).

20375909 is an equidigital number, since it uses as much as digits as its factorization.

20375909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17010, while the sum is 35.

The square root of 20375909 is about 4513.9682099014. The cubic root of 20375909 is about 273.1318402321.

The spelling of 20375909 in words is "twenty million, three hundred seventy-five thousand, nine hundred nine".