20623436599 has 2 divisors, whose sum is σ = 20623436600. Its totient is φ = 20623436598.

The previous prime is 20623436597. The next prime is 20623436671. The reversal of 20623436599 is 99563432602.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20623436599 - 2¹ = 20623436597 is a prime.

It is a super-2 number, since 2×20623436599² (a number of 21 digits) contains 22 as substring.

Together with 20623436597, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20623436597) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10311718299 + 10311718300.

It is an arithmetic number, because the mean of its divisors is an integer number (10311718300).

Almost surely, 2^20623436599 is an apocalyptic number.

20623436599 is a deficient number, since it is larger than the sum of its proper divisors (1).

20623436599 is an equidigital number, since it uses as much as digits as its factorization.

20623436599 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2099520, while the sum is 49.

The spelling of 20623436599 in words is "twenty billion, six hundred twenty-three million, four hundred thirty-six thousand, five hundred ninety-nine".