20507727391 has 2 divisors, whose sum is σ = 20507727392. Its totient is φ = 20507727390.

The previous prime is 20507727371. The next prime is 20507727403. The reversal of 20507727391 is 19372770502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20507727391 - 2¹⁹ = 20507203103 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20507727371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10253863695 + 10253863696.

It is an arithmetic number, because the mean of its divisors is an integer number (10253863696).

Almost surely, 2^20507727391 is an apocalyptic number.

20507727391 is a deficient number, since it is larger than the sum of its proper divisors (1).

20507727391 is an equidigital number, since it uses as much as digits as its factorization.

20507727391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 185220, while the sum is 43.

The spelling of 20507727391 in words is "twenty billion, five hundred seven million, seven hundred twenty-seven thousand, three hundred ninety-one".