19805713 has 2 divisors, whose sum is σ = 19805714. Its totient is φ = 19805712.

The previous prime is 19805677. The next prime is 19805749. The reversal of 19805713 is 31750891.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (19805677) and next prime (19805749).

It can be written as a sum of positive squares in only one way, i.e., 11785489 + 8020224 = 3433^2 + 2832^2 .

It is a cyclic number.

It is not a de Polignac number, because 19805713 - 2¹³ = 19797521 is a prime.

It is not a weakly prime, because it can be changed into another prime (19800713) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9902856 + 9902857.

It is an arithmetic number, because the mean of its divisors is an integer number (9902857).

Almost surely, 2^19805713 is an apocalyptic number.

It is an amenable number.

19805713 is a deficient number, since it is larger than the sum of its proper divisors (1).

19805713 is an equidigital number, since it uses as much as digits as its factorization.

19805713 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7560, while the sum is 34.

The square root of 19805713 is about 4450.3609965934. The cubic root of 19805713 is about 270.5599399311.

The spelling of 19805713 in words is "nineteen million, eight hundred five thousand, seven hundred thirteen".