20701309 has 2 divisors, whose sum is σ = 20701310. Its totient is φ = 20701308.

The previous prime is 20701301. The next prime is 20701319. The reversal of 20701309 is 90310702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20025625 + 675684 = 4475^2 + 822^2 .

It is a cyclic number.

It is not a de Polignac number, because 20701309 - 2³ = 20701301 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20701309.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20701301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10350654 + 10350655.

It is an arithmetic number, because the mean of its divisors is an integer number (10350655).

Almost surely, 2^20701309 is an apocalyptic number.

It is an amenable number.

20701309 is a deficient number, since it is larger than the sum of its proper divisors (1).

20701309 is an equidigital number, since it uses as much as digits as its factorization.

20701309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 378, while the sum is 22.

The square root of 20701309 is about 4549.8691189967. The cubic root of 20701309 is about 274.5781255899.

The spelling of 20701309 in words is "twenty million, seven hundred one thousand, three hundred nine".