20504232493 has 2 divisors, whose sum is σ = 20504232494. Its totient is φ = 20504232492.

The previous prime is 20504232479. The next prime is 20504232509. The reversal of 20504232493 is 39423240502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20459583369 + 44649124 = 143037^2 + 6682^2 .

It is a cyclic number.

It is not a de Polignac number, because 20504232493 - 2⁵ = 20504232461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20504232193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10252116246 + 10252116247.

It is an arithmetic number, because the mean of its divisors is an integer number (10252116247).

Almost surely, 2^20504232493 is an apocalyptic number.

It is an amenable number.

20504232493 is a deficient number, since it is larger than the sum of its proper divisors (1).

20504232493 is an equidigital number, since it uses as much as digits as its factorization.

20504232493 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 34.

Adding to 20504232493 its reverse (39423240502), we get a palindrome (59927472995).

The spelling of 20504232493 in words is "twenty billion, five hundred four million, two hundred thirty-two thousand, four hundred ninety-three".