20100709 has 2 divisors, whose sum is σ = 20100710. Its totient is φ = 20100708.

The previous prime is 20100673. The next prime is 20100713. The reversal of 20100709 is 90700102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19775809 + 324900 = 4447^2 + 570^2 .

It is a cyclic number.

It is not a de Polignac number, because 20100709 - 2¹⁷ = 19969637 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20100719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10050354 + 10050355.

It is an arithmetic number, because the mean of its divisors is an integer number (10050355).

Almost surely, 2^20100709 is an apocalyptic number.

It is an amenable number.

20100709 is a deficient number, since it is larger than the sum of its proper divisors (1).

20100709 is an equidigital number, since it uses as much as digits as its factorization.

20100709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 126, while the sum is 19.

The square root of 20100709 is about 4483.3814247730. The cubic root of 20100709 is about 271.8966095300.

The spelling of 20100709 in words is "twenty million, one hundred thousand, seven hundred nine".