20319620267 has 4 divisors (see below), whose sum is σ = 20319908256. Its totient is φ = 20319332280.

The previous prime is 20319620249. The next prime is 20319620297. The reversal of 20319620267 is 76202691302.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 76202691302 = 2 ⋅38101345651.

It is a cyclic number.

It is not a de Polignac number, because 20319620267 - 2⁸ = 20319620011 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20319620267.

It is not an unprimeable number, because it can be changed into a prime (20319620297) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41453 + ... + 205809.

It is an arithmetic number, because the mean of its divisors is an integer number (5079977064).

Almost surely, 2^20319620267 is an apocalyptic number.

20319620267 is a deficient number, since it is larger than the sum of its proper divisors (287989).

20319620267 is a wasteful number, since it uses less digits than its factorization.

20319620267 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287988.

The product of its (nonzero) digits is 54432, while the sum is 38.

The spelling of 20319620267 in words is "twenty billion, three hundred nineteen million, six hundred twenty thousand, two hundred sixty-seven".