20839711 has 2 divisors, whose sum is σ = 20839712. Its totient is φ = 20839710.

The previous prime is 20839703. The next prime is 20839727. The reversal of 20839711 is 11793802.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20839711 - 2³ = 20839703 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20831711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10419855 + 10419856.

It is an arithmetic number, because the mean of its divisors is an integer number (10419856).

Almost surely, 2^20839711 is an apocalyptic number.

20839711 is a deficient number, since it is larger than the sum of its proper divisors (1).

20839711 is an equidigital number, since it uses as much as digits as its factorization.

20839711 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 20839711 is about 4565.0532307959. The cubic root of 20839711 is about 275.1886793317.

The spelling of 20839711 in words is "twenty million, eight hundred thirty-nine thousand, seven hundred eleven".