20434947347 has 2 divisors, whose sum is σ = 20434947348. Its totient is φ = 20434947346.

The previous prime is 20434947307. The next prime is 20434947349. The reversal of 20434947347 is 74374943402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20434947347 - 2¹⁸ = 20434685203 is a prime.

Together with 20434947349, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20434947349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10217473673 + 10217473674.

It is an arithmetic number, because the mean of its divisors is an integer number (10217473674).

Almost surely, 2^20434947347 is an apocalyptic number.

20434947347 is a deficient number, since it is larger than the sum of its proper divisors (1).

20434947347 is an equidigital number, since it uses as much as digits as its factorization.

20434947347 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2032128, while the sum is 47.

The spelling of 20434947347 in words is "twenty billion, four hundred thirty-four million, nine hundred forty-seven thousand, three hundred forty-seven".