20694239 has 2 divisors, whose sum is σ = 20694240. Its totient is φ = 20694238.

The previous prime is 20694229. The next prime is 20694263. The reversal of 20694239 is 93249602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20694239 - 2¹² = 20690143 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 20694199 and 20694208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20694229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10347119 + 10347120.

It is an arithmetic number, because the mean of its divisors is an integer number (10347120).

Almost surely, 2^20694239 is an apocalyptic number.

20694239 is a deficient number, since it is larger than the sum of its proper divisors (1).

20694239 is an equidigital number, since it uses as much as digits as its factorization.

20694239 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 35.

The square root of 20694239 is about 4549.0921072232. The cubic root of 20694239 is about 274.5468636637.

The spelling of 20694239 in words is "twenty million, six hundred ninety-four thousand, two hundred thirty-nine".