20042145791 has 2 divisors, whose sum is σ = 20042145792. Its totient is φ = 20042145790.

The previous prime is 20042145727. The next prime is 20042145797. The reversal of 20042145791 is 19754124002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20042145791 - 2⁶ = 20042145727 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20042145797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10021072895 + 10021072896.

It is an arithmetic number, because the mean of its divisors is an integer number (10021072896).

Almost surely, 2^20042145791 is an apocalyptic number.

20042145791 is a deficient number, since it is larger than the sum of its proper divisors (1).

20042145791 is an equidigital number, since it uses as much as digits as its factorization.

20042145791 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20160, while the sum is 35.

Adding to 20042145791 its reverse (19754124002), we get a palindrome (39796269793).

The spelling of 20042145791 in words is "twenty billion, forty-two million, one hundred forty-five thousand, seven hundred ninety-one".