20710691899 has 2 divisors, whose sum is σ = 20710691900. Its totient is φ = 20710691898.

The previous prime is 20710691857. The next prime is 20710691909. The reversal of 20710691899 is 99819601702.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20710691899 - 2²³ = 20702303291 is a prime.

It is not a weakly prime, because it can be changed into another prime (20710691819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10355345949 + 10355345950.

It is an arithmetic number, because the mean of its divisors is an integer number (10355345950).

Almost surely, 2^20710691899 is an apocalyptic number.

20710691899 is a deficient number, since it is larger than the sum of its proper divisors (1).

20710691899 is an equidigital number, since it uses as much as digits as its factorization.

20710691899 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 489888, while the sum is 52.

The spelling of 20710691899 in words is "twenty billion, seven hundred ten million, six hundred ninety-one thousand, eight hundred ninety-nine".