20394937 has 2 divisors, whose sum is σ = 20394938. Its totient is φ = 20394936.

The previous prime is 20394863. The next prime is 20394953. The reversal of 20394937 is 73949302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15832441 + 4562496 = 3979^2 + 2136^2 .

It is a cyclic number.

It is not a de Polignac number, because 20394937 - 2¹⁵ = 20362169 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 20394896 and 20394905.

It is not a weakly prime, because it can be changed into another prime (20394977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10197468 + 10197469.

It is an arithmetic number, because the mean of its divisors is an integer number (10197469).

Almost surely, 2^20394937 is an apocalyptic number.

It is an amenable number.

20394937 is a deficient number, since it is larger than the sum of its proper divisors (1).

20394937 is an equidigital number, since it uses as much as digits as its factorization.

20394937 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40824, while the sum is 37.

The square root of 20394937 is about 4516.0753979534. The cubic root of 20394937 is about 273.2168349794.

The spelling of 20394937 in words is "twenty million, three hundred ninety-four thousand, nine hundred thirty-seven".