20047608869 has 2 divisors, whose sum is σ = 20047608870. Its totient is φ = 20047608868.

The previous prime is 20047608851. The next prime is 20047608907. The reversal of 20047608869 is 96880674002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11785707844 + 8261901025 = 108562^2 + 90895^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20047608869 is a prime.

It is a super-2 number, since 2×20047608869² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20047608809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10023804434 + 10023804435.

It is an arithmetic number, because the mean of its divisors is an integer number (10023804435).

Almost surely, 2^20047608869 is an apocalyptic number.

It is an amenable number.

20047608869 is a deficient number, since it is larger than the sum of its proper divisors (1).

20047608869 is an equidigital number, since it uses as much as digits as its factorization.

20047608869 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1161216, while the sum is 50.

The spelling of 20047608869 in words is "twenty billion, forty-seven million, six hundred eight thousand, eight hundred sixty-nine".