20770609 has 2 divisors, whose sum is σ = 20770610. Its totient is φ = 20770608.

The previous prime is 20770573. The next prime is 20770619. The reversal of 20770609 is 90607702.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20223009 + 547600 = 4497^2 + 740^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20770609 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20770619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10385304 + 10385305.

It is an arithmetic number, because the mean of its divisors is an integer number (10385305).

Almost surely, 2^20770609 is an apocalyptic number.

It is an amenable number.

20770609 is a deficient number, since it is larger than the sum of its proper divisors (1).

20770609 is an equidigital number, since it uses as much as digits as its factorization.

20770609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5292, while the sum is 31.

The square root of 20770609 is about 4557.4783597950. The cubic root of 20770609 is about 274.8841782234.

The spelling of 20770609 in words is "twenty million, seven hundred seventy thousand, six hundred nine".