20541530497 has 2 divisors, whose sum is σ = 20541530498. Its totient is φ = 20541530496.

The previous prime is 20541530479. The next prime is 20541530543. The reversal of 20541530497 is 79403514502.

It is a happy number.

Together with previous prime (20541530479) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14777076721 + 5764453776 = 121561^2 + 75924^2 .

It is a cyclic number.

It is not a de Polignac number, because 20541530497 - 2⁷ = 20541530369 is a prime.

It is not a weakly prime, because it can be changed into another prime (20541531497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10270765248 + 10270765249.

It is an arithmetic number, because the mean of its divisors is an integer number (10270765249).

Almost surely, 2^20541530497 is an apocalyptic number.

It is an amenable number.

20541530497 is a deficient number, since it is larger than the sum of its proper divisors (1).

20541530497 is an equidigital number, since it uses as much as digits as its factorization.

20541530497 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 151200, while the sum is 40.

The spelling of 20541530497 in words is "twenty billion, five hundred forty-one million, five hundred thirty thousand, four hundred ninety-seven".