20297902871 has 2 divisors, whose sum is σ = 20297902872. Its totient is φ = 20297902870.

The previous prime is 20297902843. The next prime is 20297902909. The reversal of 20297902871 is 17820979202.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20297902871 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20297902771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10148951435 + 10148951436.

It is an arithmetic number, because the mean of its divisors is an integer number (10148951436).

Almost surely, 2^20297902871 is an apocalyptic number.

20297902871 is a deficient number, since it is larger than the sum of its proper divisors (1).

20297902871 is an equidigital number, since it uses as much as digits as its factorization.

20297902871 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 254016, while the sum is 47.

The spelling of 20297902871 in words is "twenty billion, two hundred ninety-seven million, nine hundred two thousand, eight hundred seventy-one".