20504197349 has 2 divisors, whose sum is σ = 20504197350. Its totient is φ = 20504197348.

The previous prime is 20504197303. The next prime is 20504197379. The reversal of 20504197349 is 94379140502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19709352100 + 794845249 = 140390^2 + 28193^2 .

It is a cyclic number.

It is not a de Polignac number, because 20504197349 - 2²⁸ = 20235761893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20504197379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10252098674 + 10252098675.

It is an arithmetic number, because the mean of its divisors is an integer number (10252098675).

Almost surely, 2^20504197349 is an apocalyptic number.

It is an amenable number.

20504197349 is a deficient number, since it is larger than the sum of its proper divisors (1).

20504197349 is an equidigital number, since it uses as much as digits as its factorization.

20504197349 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 272160, while the sum is 44.

The spelling of 20504197349 in words is "twenty billion, five hundred four million, one hundred ninety-seven thousand, three hundred forty-nine".