20784294497 has 2 divisors, whose sum is σ = 20784294498. Its totient is φ = 20784294496.

The previous prime is 20784294491. The next prime is 20784294527. The reversal of 20784294497 is 79449248702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14066197201 + 6718097296 = 118601^2 + 81964^2 .

It is a cyclic number.

It is not a de Polignac number, because 20784294497 - 2¹⁴ = 20784278113 is a prime.

It is not a weakly prime, because it can be changed into another prime (20784294491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10392147248 + 10392147249.

It is an arithmetic number, because the mean of its divisors is an integer number (10392147249).

Almost surely, 2^20784294497 is an apocalyptic number.

It is an amenable number.

20784294497 is a deficient number, since it is larger than the sum of its proper divisors (1).

20784294497 is an equidigital number, since it uses as much as digits as its factorization.

20784294497 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8128512, while the sum is 56.

The spelling of 20784294497 in words is "twenty billion, seven hundred eighty-four million, two hundred ninety-four thousand, four hundred ninety-seven".