20100000047 has 2 divisors, whose sum is σ = 20100000048. Its totient is φ = 20100000046.

The previous prime is 20099999981. The next prime is 20100000049. The reversal of 20100000047 is 74000000102.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20100000047 - 2²⁶ = 20032891183 is a prime.

Together with 20100000049, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 20099999977 and 20100000040.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20100000049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10050000023 + 10050000024.

It is an arithmetic number, because the mean of its divisors is an integer number (10050000024).

Almost surely, 2^20100000047 is an apocalyptic number.

20100000047 is a deficient number, since it is larger than the sum of its proper divisors (1).

20100000047 is an equidigital number, since it uses as much as digits as its factorization.

20100000047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56, while the sum is 14.

Adding to 20100000047 its reverse (74000000102), we get a palindrome (94100000149).

The spelling of 20100000047 in words is "twenty billion, one hundred million, forty-seven", and thus it is an aban number.