20434947901 has 2 divisors, whose sum is σ = 20434947902. Its totient is φ = 20434947900.

The previous prime is 20434947851. The next prime is 20434947947. The reversal of 20434947901 is 10974943402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17798228100 + 2636719801 = 133410^2 + 51349^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20434947901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20434942901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10217473950 + 10217473951.

It is an arithmetic number, because the mean of its divisors is an integer number (10217473951).

Almost surely, 2^20434947901 is an apocalyptic number.

It is an amenable number.

20434947901 is a deficient number, since it is larger than the sum of its proper divisors (1).

20434947901 is an equidigital number, since it uses as much as digits as its factorization.

20434947901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 217728, while the sum is 43.

The spelling of 20434947901 in words is "twenty billion, four hundred thirty-four million, nine hundred forty-seven thousand, nine hundred one".