20439347 has 2 divisors, whose sum is σ = 20439348. Its totient is φ = 20439346.

The previous prime is 20439329. The next prime is 20439379. The reversal of 20439347 is 74393402.

It is an a-pointer prime, because the next prime (20439379) can be obtained adding 20439347 to its sum of digits (32).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20439347 - 2⁶ = 20439283 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20439317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10219673 + 10219674.

It is an arithmetic number, because the mean of its divisors is an integer number (10219674).

Almost surely, 2^20439347 is an apocalyptic number.

20439347 is a deficient number, since it is larger than the sum of its proper divisors (1).

20439347 is an equidigital number, since it uses as much as digits as its factorization.

20439347 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 32.

The square root of 20439347 is about 4520.9896040579. The cubic root of 20439347 is about 273.4150012095.

The spelling of 20439347 in words is "twenty million, four hundred thirty-nine thousand, three hundred forty-seven".