20499990593 has 2 divisors, whose sum is σ = 20499990594. Its totient is φ = 20499990592.

The previous prime is 20499990557. The next prime is 20499990653. The reversal of 20499990593 is 39509999402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19895666704 + 604323889 = 141052^2 + 24583^2 .

It is a cyclic number.

It is not a de Polignac number, because 20499990593 - 2⁸ = 20499990337 is a prime.

It is a super-2 number, since 2×20499990593² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20499993593) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10249995296 + 10249995297.

It is an arithmetic number, because the mean of its divisors is an integer number (10249995297).

Almost surely, 2^20499990593 is an apocalyptic number.

It is an amenable number.

20499990593 is a deficient number, since it is larger than the sum of its proper divisors (1).

20499990593 is an equidigital number, since it uses as much as digits as its factorization.

20499990593 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7085880, while the sum is 59.

It can be divided in two parts, 204999 and 90593, that added together give a palindrome (295592).

The spelling of 20499990593 in words is "twenty billion, four hundred ninety-nine million, nine hundred ninety thousand, five hundred ninety-three".