20704279 has 2 divisors, whose sum is σ = 20704280. Its totient is φ = 20704278.

The previous prime is 20704253. The next prime is 20704309. The reversal of 20704279 is 97240702.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20704279 - 2²³ = 12315671 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20704279.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20704219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10352139 + 10352140.

It is an arithmetic number, because the mean of its divisors is an integer number (10352140).

Almost surely, 2^20704279 is an apocalyptic number.

20704279 is a deficient number, since it is larger than the sum of its proper divisors (1).

20704279 is an equidigital number, since it uses as much as digits as its factorization.

20704279 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 20704279 is about 4550.1954903059. The cubic root of 20704279 is about 274.5912561290.

The spelling of 20704279 in words is "twenty million, seven hundred four thousand, two hundred seventy-nine".