20743725391 has 2 divisors, whose sum is σ = 20743725392. Its totient is φ = 20743725390.

The previous prime is 20743725377. The next prime is 20743725403. The reversal of 20743725391 is 19352734702.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20743725391 - 2⁹ = 20743724879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20743725341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10371862695 + 10371862696.

It is an arithmetic number, because the mean of its divisors is an integer number (10371862696).

Almost surely, 2^20743725391 is an apocalyptic number.

20743725391 is a deficient number, since it is larger than the sum of its proper divisors (1).

20743725391 is an equidigital number, since it uses as much as digits as its factorization.

20743725391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 317520, while the sum is 43.

The spelling of 20743725391 in words is "twenty billion, seven hundred forty-three million, seven hundred twenty-five thousand, three hundred ninety-one".