20434947947 has 2 divisors, whose sum is σ = 20434947948. Its totient is φ = 20434947946.

The previous prime is 20434947901. The next prime is 20434947979. The reversal of 20434947947 is 74974943402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20434947947 - 2¹⁴ = 20434931563 is a prime.

It is not a weakly prime, because it can be changed into another prime (20434947347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10217473973 + 10217473974.

It is an arithmetic number, because the mean of its divisors is an integer number (10217473974).

Almost surely, 2^20434947947 is an apocalyptic number.

20434947947 is a deficient number, since it is larger than the sum of its proper divisors (1).

20434947947 is an equidigital number, since it uses as much as digits as its factorization.

20434947947 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6096384, while the sum is 53.

The spelling of 20434947947 in words is "twenty billion, four hundred thirty-four million, nine hundred forty-seven thousand, nine hundred forty-seven".