20259411791 has 2 divisors, whose sum is σ = 20259411792. Its totient is φ = 20259411790.

The previous prime is 20259411787. The next prime is 20259411863. The reversal of 20259411791 is 19711495202.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20259411791 - 2² = 20259411787 is a prime.

It is a super-2 number, since 2×20259411791² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20259417791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10129705895 + 10129705896.

It is an arithmetic number, because the mean of its divisors is an integer number (10129705896).

Almost surely, 2^20259411791 is an apocalyptic number.

20259411791 is a deficient number, since it is larger than the sum of its proper divisors (1).

20259411791 is an equidigital number, since it uses as much as digits as its factorization.

20259411791 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45360, while the sum is 41.

The spelling of 20259411791 in words is "twenty billion, two hundred fifty-nine million, four hundred eleven thousand, seven hundred ninety-one".