20343999187 has 2 divisors, whose sum is σ = 20343999188. Its totient is φ = 20343999186.

The previous prime is 20343999157. The next prime is 20343999197. The reversal of 20343999187 is 78199934302.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20343999187 is a prime.

It is not a weakly prime, because it can be changed into another prime (20343999157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10171999593 + 10171999594.

It is an arithmetic number, because the mean of its divisors is an integer number (10171999594).

Almost surely, 2^20343999187 is an apocalyptic number.

20343999187 is a deficient number, since it is larger than the sum of its proper divisors (1).

20343999187 is an equidigital number, since it uses as much as digits as its factorization.

20343999187 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2939328, while the sum is 55.

The spelling of 20343999187 in words is "twenty billion, three hundred forty-three million, nine hundred ninety-nine thousand, one hundred eighty-seven".