20199723647 has 2 divisors, whose sum is σ = 20199723648. Its totient is φ = 20199723646.

The previous prime is 20199723637. The next prime is 20199723653. The reversal of 20199723647 is 74632799102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20199723647 - 2¹⁰ = 20199722623 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20199723595 and 20199723604.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20199723637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10099861823 + 10099861824.

It is an arithmetic number, because the mean of its divisors is an integer number (10099861824).

Almost surely, 2^20199723647 is an apocalyptic number.

20199723647 is a deficient number, since it is larger than the sum of its proper divisors (1).

20199723647 is an equidigital number, since it uses as much as digits as its factorization.

20199723647 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1143072, while the sum is 50.

The spelling of 20199723647 in words is "twenty billion, one hundred ninety-nine million, seven hundred twenty-three thousand, six hundred forty-seven".