20061747857 has 2 divisors, whose sum is σ = 20061747858. Its totient is φ = 20061747856.

The previous prime is 20061747851. The next prime is 20061747863. The reversal of 20061747857 is 75874716002.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (20061747851) and next prime (20061747863).

It can be written as a sum of positive squares in only one way, i.e., 16912742401 + 3149005456 = 130049^2 + 56116^2 .

It is a cyclic number.

It is not a de Polignac number, because 20061747857 - 2⁴ = 20061747841 is a prime.

It is not a weakly prime, because it can be changed into another prime (20061747851) 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, 10030873928 + 10030873929.

It is an arithmetic number, because the mean of its divisors is an integer number (10030873929).

Almost surely, 2^20061747857 is an apocalyptic number.

It is an amenable number.

20061747857 is a deficient number, since it is larger than the sum of its proper divisors (1).

20061747857 is an equidigital number, since it uses as much as digits as its factorization.

20061747857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 658560, while the sum is 47.

The spelling of 20061747857 in words is "twenty billion, sixty-one million, seven hundred forty-seven thousand, eight hundred fifty-seven".