20782694431 has 2 divisors, whose sum is σ = 20782694432. Its totient is φ = 20782694430.

The previous prime is 20782694353. The next prime is 20782694441. The reversal of 20782694431 is 13449628702.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20782694431 is a prime.

It is a super-2 number, since 2×20782694431² (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 (20782694441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10391347215 + 10391347216.

It is an arithmetic number, because the mean of its divisors is an integer number (10391347216).

Almost surely, 2^20782694431 is an apocalyptic number.

20782694431 is a deficient number, since it is larger than the sum of its proper divisors (1).

20782694431 is an equidigital number, since it uses as much as digits as its factorization.

20782694431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 580608, while the sum is 46.

The spelling of 20782694431 in words is "twenty billion, seven hundred eighty-two million, six hundred ninety-four thousand, four hundred thirty-one".