20794309 has 2 divisors, whose sum is σ = 20794310. Its totient is φ = 20794308.

The previous prime is 20794307. The next prime is 20794313. The reversal of 20794309 is 90349702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20702500 + 91809 = 4550^2 + 303^2 .

It is a cyclic number.

It is not a de Polignac number, because 20794309 - 2¹ = 20794307 is a prime.

Together with 20794307, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20794307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10397154 + 10397155.

It is an arithmetic number, because the mean of its divisors is an integer number (10397155).

Almost surely, 2^20794309 is an apocalyptic number.

It is an amenable number.

20794309 is a deficient number, since it is larger than the sum of its proper divisors (1).

20794309 is an equidigital number, since it uses as much as digits as its factorization.

20794309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13608, while the sum is 34.

The square root of 20794309 is about 4560.0777405654. The cubic root of 20794309 is about 274.9886893420.

The spelling of 20794309 in words is "twenty million, seven hundred ninety-four thousand, three hundred nine".