20945693 has 2 divisors, whose sum is σ = 20945694. Its totient is φ = 20945692.

The previous prime is 20945651. The next prime is 20945707. The reversal of 20945693 is 39654902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19035769 + 1909924 = 4363^2 + 1382^2 .

It is a cyclic number.

It is not a de Polignac number, because 20945693 - 2²² = 16751389 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20945623) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10472846 + 10472847.

It is an arithmetic number, because the mean of its divisors is an integer number (10472847).

Almost surely, 2^20945693 is an apocalyptic number.

It is an amenable number.

20945693 is a deficient number, since it is larger than the sum of its proper divisors (1).

20945693 is an equidigital number, since it uses as much as digits as its factorization.

20945693 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 58320, while the sum is 38.

The square root of 20945693 is about 4576.6464796836. The cubic root of 20945693 is about 275.6543886921.

The spelling of 20945693 in words is "twenty million, nine hundred forty-five thousand, six hundred ninety-three".