20713057709 has 2 divisors, whose sum is σ = 20713057710. Its totient is φ = 20713057708.

The previous prime is 20713057657. The next prime is 20713057733. The reversal of 20713057709 is 90775031702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11204857609 + 9508200100 = 105853^2 + 97510^2 .

It is a cyclic number.

It is not a de Polignac number, because 20713057709 - 2¹⁶ = 20712992173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20713053709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10356528854 + 10356528855.

It is an arithmetic number, because the mean of its divisors is an integer number (10356528855).

Almost surely, 2^20713057709 is an apocalyptic number.

It is an amenable number.

20713057709 is a deficient number, since it is larger than the sum of its proper divisors (1).

20713057709 is an equidigital number, since it uses as much as digits as its factorization.

20713057709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 92610, while the sum is 41.

The spelling of 20713057709 in words is "twenty billion, seven hundred thirteen million, fifty-seven thousand, seven hundred nine".