20320779599 has 2 divisors, whose sum is σ = 20320779600. Its totient is φ = 20320779598.

The previous prime is 20320779571. The next prime is 20320779649. The reversal of 20320779599 is 99597702302.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20320779599 is a prime.

It is a super-2 number, since 2×20320779599² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20320779599.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20320779559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10160389799 + 10160389800.

It is an arithmetic number, because the mean of its divisors is an integer number (10160389800).

Almost surely, 2^20320779599 is an apocalyptic number.

20320779599 is a deficient number, since it is larger than the sum of its proper divisors (1).

20320779599 is an equidigital number, since it uses as much as digits as its factorization.

20320779599 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2143260, while the sum is 53.

The spelling of 20320779599 in words is "twenty billion, three hundred twenty million, seven hundred seventy-nine thousand, five hundred ninety-nine".