20502791747 has 2 divisors, whose sum is σ = 20502791748. Its totient is φ = 20502791746.

The previous prime is 20502791723. The next prime is 20502791779. The reversal of 20502791747 is 74719720502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20502791747 - 2¹⁸ = 20502529603 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20502791698 and 20502791707.

It is not a weakly prime, because it can be changed into another prime (20508791747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10251395873 + 10251395874.

It is an arithmetic number, because the mean of its divisors is an integer number (10251395874).

Almost surely, 2^20502791747 is an apocalyptic number.

20502791747 is a deficient number, since it is larger than the sum of its proper divisors (1).

20502791747 is an equidigital number, since it uses as much as digits as its factorization.

20502791747 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 246960, while the sum is 44.

The spelling of 20502791747 in words is "twenty billion, five hundred two million, seven hundred ninety-one thousand, seven hundred forty-seven".