20774213 has 2 divisors, whose sum is σ = 20774214. Its totient is φ = 20774212.

The previous prime is 20774197. The next prime is 20774219. The reversal of 20774213 is 31247702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20367169 + 407044 = 4513^2 + 638^2 .

It is a cyclic number.

It is not a de Polignac number, because 20774213 - 2⁴ = 20774197 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 (20774219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10387106 + 10387107.

It is an arithmetic number, because the mean of its divisors is an integer number (10387107).

Almost surely, 2^20774213 is an apocalyptic number.

It is an amenable number.

20774213 is a deficient number, since it is larger than the sum of its proper divisors (1).

20774213 is an equidigital number, since it uses as much as digits as its factorization.

20774213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2352, while the sum is 26.

The square root of 20774213 is about 4557.8737367330. The cubic root of 20774213 is about 274.9000760928.

The spelling of 20774213 in words is "twenty million, seven hundred seventy-four thousand, two hundred thirteen".