20204202493 has 2 divisors, whose sum is σ = 20204202494. Its totient is φ = 20204202492.

The previous prime is 20204202457. The next prime is 20204202511. The reversal of 20204202493 is 39420240202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19282655044 + 921547449 = 138862^2 + 30357^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20204202493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20204202433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10102101246 + 10102101247.

It is an arithmetic number, because the mean of its divisors is an integer number (10102101247).

Almost surely, 2^20204202493 is an apocalyptic number.

It is an amenable number.

20204202493 is a deficient number, since it is larger than the sum of its proper divisors (1).

20204202493 is an equidigital number, since it uses as much as digits as its factorization.

20204202493 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 28.

Adding to 20204202493 its reverse (39420240202), we get a palindrome (59624442695).

The spelling of 20204202493 in words is "twenty billion, two hundred four million, two hundred two thousand, four hundred ninety-three".