20849284747 has 2 divisors, whose sum is σ = 20849284748. Its totient is φ = 20849284746.

The previous prime is 20849284727. The next prime is 20849284759. The reversal of 20849284747 is 74748294802.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20849284747 is a prime.

It is a super-2 number, since 2×20849284747² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20849284717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10424642373 + 10424642374.

It is an arithmetic number, because the mean of its divisors is an integer number (10424642374).

Almost surely, 2^20849284747 is an apocalyptic number.

20849284747 is a deficient number, since it is larger than the sum of its proper divisors (1).

20849284747 is an equidigital number, since it uses as much as digits as its factorization.

20849284747 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7225344, while the sum is 55.

The spelling of 20849284747 in words is "twenty billion, eight hundred forty-nine million, two hundred eighty-four thousand, seven hundred forty-seven".