20541386491 has 2 divisors, whose sum is σ = 20541386492. Its totient is φ = 20541386490.

The previous prime is 20541386479. The next prime is 20541386497. The reversal of 20541386491 is 19468314502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20541386491 - 2⁹ = 20541385979 is a prime.

It is not a weakly prime, because it can be changed into another prime (20541386497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10270693245 + 10270693246.

It is an arithmetic number, because the mean of its divisors is an integer number (10270693246).

Almost surely, 2^20541386491 is an apocalyptic number.

20541386491 is a deficient number, since it is larger than the sum of its proper divisors (1).

20541386491 is an equidigital number, since it uses as much as digits as its factorization.

20541386491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 207360, while the sum is 43.

The spelling of 20541386491 in words is "twenty billion, five hundred forty-one million, three hundred eighty-six thousand, four hundred ninety-one".